Best Cat Scratching Post Ever AND Cat Weight-loss Device




About: I am a former zookeeper. One thing you may not know, zookeepers often have to make their own specialized tools, enclosures and supplies. It's just part of the job, because there aren't really any box store...

CW's First Bogus Theory of Cats...

Watching cat behavior over the years, I have noticed that they scratch not only to flex their feet and claws, they actually like to stretch their shoulders and back, using their claws as leverage. This stretching behavior will tip over a commercially available 'normal' sized scratching post.

Whenever I have observed one of my cats try to get a good stretch out of a standard cat post, it has moved or tipped and the cat has immediately given up and gone to find a more suitable object for an anchor - usually my sofa.

I have noticed that when my cats start scratching at the furniture, the pieces they choose to destroy have a few things in common:

1. They are stable and heavy. (I have observed that my cats always prefer a post that does not move when they dig their claws in and yank.)

2. They are wider than any standard cat posts. (My cats prefer a post that is wider than their shoulders.)

3. They are taller than any standard cat posts. (My cats prefer a post that is at least twice as tall as they are long.  They like to reach up as high as they can and get a good long stretch.)

Eventually, I developed a theory, which I have dubbed CW's first bogus theory of cats:

Merely disciplining a cat for using the furniture as a scratching post, but not providing them with an alternative that meets their needs is not likely to be a successful method of training. A post that serves a cat's needs better than the furniture does will be naturally preferred for scratching, and it should make training the cats much easier, since they will not be deprived of stretching out and getting a good scratch in, when their physiology demands it.

So, I have created this tree-sized post, which allows a cat to flex their whole body, from their paws all the way to their tail, if they so choose.  Also, it is tall enough to allow them to exercise their innate and instinctive climbing abilities, without wrecking the curtains or other furniture.

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Step 1: Get Ready - Collect Supplies and Tools

  • 10 x wide elbows (Lowes part number: 96076 A21 2X1 ANGLE)
  • 2 x narrow elbows (Lowes part number: 315683 STAN 1-1/2” ZN CNR BRC)
  • 22 x .5 inch washers
  • 26 x .75 inch screws
  • 44 x 1 inch screws
  • 2 x scrap lumber (½ inch thick, by 3.5 inches wide, by 36 inches long)
  • 1 x concrete tube (10 inches in diameter, by 48 inches tall)
  • 1 x edge-glued wood panel .75 inches thick, by 20 inches wide, by 36 inches long
  • ½ bucket of plaster (about 6 lbs)
  • A few feet of duct tape
  • 5 x rolls of sisal (.25 inches thick, by 100 feet long, for a total of 500 ft)
  • 1 x plywood circle (12 inch diameter or 18 inch if you have two or more cats)
  • 1 x circle of foam (12 inch diameter or 18 inch if you have two or more cats)
  • 1 x circle of cloth batting (12 inch diameter or 18 inch if you have two or more cats)
  • 1 x large bottle of fast-drying wood glue (16 oz)
  • 1 x piece of cloth or carpet to cover the top platform (I used a cotton bath mat.)

  • pencil
  • hand saw
  • screw driver
  • drill with 1/8” bit and 1/2” bit
  • bucket
  • stirring stick for plaster
  • mixing bucket for plaster
  • scissors
  • magnet on a string (for fishing out tools and screws that you drop into the tube)
  • patience*

*Wrapping the sisal takes hours, so get your patience all stocked up before you start.

Step 2: Prepare the Post

Carve a notch out of two sides of the cardboard tube on the top and bottom edges, to accommodate the depth of the metal elbow brackets.

Step 3: Reinforce the Cardboard Post With Wood

Saw the scrap lumber into two small pieces, about five inches long, and two longish pieces, about 31” long. These will go inside of the cardboard tube, to stabilize and strengthen the design, so don't worry about how they look.

To attach each wood support inside of the cardboard tube, first screw the long side of a wide bracket to the end of the wood. Leave a ½ inch space to one side of the wood, which will be used later by a second, narrower bracket. (see photos)

Line up the bracket on the end of the piece of wood with a notch in the tube end. Place one of the narrow brackets on the outside of the tube, where the screws will be able to reach into the wood. Screw through the cardboard and into the wood from the outside of the tube, using long screws.

(I used 1.25 inch screws, which protrude, because that's what I had lying around and the protruding ends will be safely sealed inside the post, which will never be accessible by my cats or kids. You can use 1” screws or shorter, as long as they get a good bite on the wood.)

Add several more screws and washers along the length of the wood. Fasten it to the tube as securely as possible. Be careful not to dimple the cardboard tube too much, causing weak points. Just screw the washers down until they are snug and you are sure you have a good connection to the wood inside. There is no need to crank them all the way down.

These wood supports will be the structural strength of the post, and will bear the weight and force of your cat jumping on and off of the post, climbing up and down, clawing at it, and generally trying to wreck it. If your cats are anywhere near as rambunctious as mine, without this wood support, I think the cardboard would give out pretty quickly.

Step 4: Attach the Base

Screw the post as-is to the large wood panel. I lined mine up a little towards the back of the rectangle, so that it will be closer to the wall and it hopefully won't bang around too much when my cats jump against it. If you are going to have your post free-standing in the middle of the room, you may want to use a 30” or larger square for stability, instead of a rectangle.

Step 5: Add Plaster for Weight and Stability

Use duct tape to seal around the edges of the base.

Mix about three pounds (¼ bucket) of plaster and pour it in. Wait a few minutes until the plaster sets, then mix another three pounds and add it. (By adding the plaster a little at a time, you preserve the weak seal made by the duct tape. If you add too much weight of liquid plaster at one time, the duct tape will give way and leak all over.)

Wait a couple of hours for the plaster to cure and the cardboard tube to dry completely before proceeding.

Step 6: Reinforce the Base Joint

Add the remaining wide brackets around the bottom of the post, to secure it to the wood. Use short screws to fasten the brackets to the wood base and longer screws to go deeply into the plaster.

Step 7: Add the Platform Top

Using the same technique as before, add the short pieces of wood to the inside of the top of the post. Secure them from the outside using washers and long screws.

Set the 12” diameter plywood circle on top of the post, lining it up so that the brackets do not protrude past the edges. If you're drilling pilot holes, as I did, it is helpful to trace the outline of the brackets, as well as the location of the screw holes.

Secure the plywood using short screws, so they don't protrude from the top of the wood.

You could also use this piece of plywood as a base to secure a larger platform to the post. I haven't decided whether to make a larger platform yet. I'm going to wait and see how often my cats perch up there before deciding.

Note: Four months later I added an 18 inch circle for the top platform because my two cats were fighting over it too much.  If you have only one cat, 12" will probably be fine.  If you have two or more cats, I suggest using an 18" or larger platform from the very beginning, now that I've seen how my cats squabbled over it.

If you use a larger platform, offset it, so a cat can climb over the lip easily.  Make it so that the ledge on one side overhangs no more than a few inches, depending on the athletic ability and physical condition of your cat(s).

Step 8: Add Handles to the Base

At this point, I found that the post was becoming too awkward to move easily. You want to avoid picking it up by the post, or putting too much sideways pressure on it, so it is problematic to move without help.

To solve the problem, I propped up the base and drilled two pairs of ½” holes. Then, I knotted sisal through them, to make simple handles.

Even with the handles, it's heavy and awkward at this point, so you may want to enlist someone to help you move it.

(Also, if you were smarter than me, you could put the handles on the base BEFORE you attach the post to it.)

Step 9: Wrap the Sisal

This step takes a long time. It took me about three hours.

Starting at the base and working your way up in a spiral, wrap and glue the sisal to the post. I glued three sides of the post, leaving one side densely packed but unglued. (This way, I could sit on one side of the post, glue to my right, center, and left for each row, without having to constantly get up and walk around the post.)

You have to glue at least half way around the post, all the way up, or the sisal will slide and pull into big gaps after the cats get their claws into it.

Be sure to cover up the screws and washers all the way around the post. They have a tendency to grab the sisal and prevent it from lining up snug with the other layers.

Also, watch out for unsightly globs of glue on the outside of the sisal. The Elmer's that I got dries to a light orange that blends in as long as there isn't a lot of excess showing. If you're not careful, you could have a blotchy and unattractive orange post when you're done.

Step 10: Cover the Bottom Brackets

Use a couple of rows of sisal to cover the brackets at the base. Alternatively, you could use carpet to cover the whole piece of wood, but I didn't want to do that. You could also stain the base before you start, if you want a finished appearance, or if you want to match your furniture.

Step 11: Finish the Top

Use a small amount of glue to tack the foam to the top of the plywood platform. If it ever wears out, you can replace it easily if you don't over-glue it.

Put the batting on top of the foam. (I was using scraps, so it is in two pieces.  You can piece it together or just cut out one big circle.  The cover will hold it all in place, no matter what.)

Cover with whatever fabric or carpet you like.  I used a cotton bath mat that my cats already adopted to sleep on.

The cover in these photos is basically a circle of cloth with a long rectangle of cloth sewn around it, to make the sides.  I stitched some pretty strong elastic to the bottom edge, and it stays on even when they are rough-housing.

Step 12: Cat Reactions

Overall, the scratching post has been a HUGE success for my two youthful and exuberant cats. They get a LOT of exercise because of it.

When we were bringing the post into the room with the cats for the first time, they were already attempting to climb on it before we could even set it down.  Within five minutes, they had both climbed it and they played King of the Mountain for the rest of the evening.

At first, they were still clawing the furniture, but I would pick them up and move them to the post, demonstrate scratching on it, and reward them if they completed their scratching behavior on the post.  After a few weeks, they started going to the post and scratching at it, in order to get attention and petting.  (Who's training who?)

After six months, they still scratch at the other furniture occasionally, when they are in a naughty mood and running around like maniacs, to get attention.  But, they know they will be scolded and for the most part, they use the post.  My new sofa is still in one piece.

Both of my cats have been using the post daily (or more likely hourly) for the past six months.  They climb up and down the post like a tree, with their arms spread out around it.  They fight and tumble all over it and they like to throw themselves bodily through the air and stick to the side of it like velcro. 

After I put a larger, 18" diameter top on the post, I sometimes now find them curled up on top of it together, but their favorite game is still King of the Mountain.

Step 13: About Tubby Cats

I have one large and tubby cat that we affectionately call "Two-ton" who is a little under two years old, and one sleek, panther-type cat that is most frequently called "Hey, are you being naughty?" due to her wacked-out 1 year old behavior. Their names are actually Zenith and Quasar. They are both rescue cats, and Two-ton was very ill and skeletal when we got her, but she has blossomed into a weighty Persian-type cat with a very sweet disposition and a strong tendency to become overweight due to her traumatic time of starvation before she was rescued.

When Two-ton hits the side of the post at high velocity, it sounds like an elephant breakdancing, but it's wonderful because she gets about a thousand times more exercise with this post in the house than she otherwise would. If she jumped on my furniture like that, I would scold her and not allow it, so this type of physical behavior would be unavailable to her and we'd probably end up calling her "Four-tons of fun".

Unfortunately, this is exactly what happens to many cats that are overweight. When they do play hard or stretch by scratching, they get scolded, so they are deprived of whatever little exercise they might get indoors and they get even tubbier over time, until they are finally obese and unhealthy.

If you have a tubby cat, this kind of toy will encourage them to exercise more and to use their claws and their body in the way it was designed to operate. But please be careful - if your cat is extremely obese, jumping down from a height can be dangerous to their shoulder joints and spine. To add a dimension of safety, you can add one or two lower posts next to the tall one, so the animal can jump down in shorter stages, but can still climb up and jump up the big one if they want to.  This is also helpful for older cats that might have arthritis or other joint issues. 

If you do have a tubby cat that needs exercise, or an elderly cat, bring a photo of this cat post to your vet and ask them what they think about it and whether it would be safe for your animal before you build it.

Step 14: Please Adopt a Cat

Please, if you have room in your home, adopt a black cat from the pound. Black cats are the most difficult cats for rescue organizations to place because of ridiculous superstition and purely wacky religious beliefs. Every year at Halloween black cats are abused and mutilated by people. Many of them languish for months in shelters, until they have to be euthanized because of lack of space. If you are a rational person, and can make the time and room in your life for a cat, you can save them from such a fate. Every shelter, everywhere ALWAYS has at least one black cat for adoption.

Zenith adopted Quasar completely as her own kitten, even though the animals are not related and she was barely over a year old when we brought them home from the rescue.  She even made milk for the kitten.  Although she had been at the rescue for two months, being fed regularly, she was still practically starved to death, to the point that she was skeletal when we brought her home.  She must have been mostly dead when they took her in. 

When we got her, she had an upper respiratory infection that caused her to cough up and sneeze blood, and she had just been spayed - she still had the stitches in place.  We brought her and the 2 month old kitten, Quasar, home together and within a few days, she just spontaneously started producing milk.  This for an unknown kitten, even when she was in such terrible shape and recovering from surgery. 

This is just one more story of why some rescue animals are very much worth adopting.  They are not all there because of behavioral problems or incurable illnesses.  After just a few visits  to the vet, and a good diet of healthy food, Zen has turned into the sweetest, lovey-est cat you ever met - and she also likes her belly rubbed, if you can believe it. 

Quasar is going through her wacky teenaged time, but because we got her as a kitten, she does not remember any hardship in her life.  Between Zenith, her adopted mom, and the humans in her life, she's spoiled rotten, but she's a sweetie anyway.  She's our trickster cat.  She opens and closes doors, drawers, and cabinets.  She plays catch.  (no, really, she does)  Plus, she knows how to take the battery out of a cell phone and stash the pieces under the bed.  It took us forever to find that thing.  :)

If you just can't adopt, then please volunteer.  Or if you can't do that, then send any amount of money, even only a dollar will help, to a LOCAL organization.  National organizations use most of the donations they get for overhead costs and not a lot of it gets to the actual animals.  At the local level, you can also donate items like food and litter, office paper, bleach, etc.

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55 Discussions


3 years ago

I used 8 feet of 6 in tubing, scrap plywood and a bunch of 1"manilla rope... Thanks for the great instructable :-)

photo-2015-10-18, 10:50 AM.jpgphoto-2015-10-18, 10:50 AM.jpg
2 replies

Reply 3 years ago

love your scratching post. any estimate of how heavy it is? is it able to come apart for easier moving?


Reply 1 year ago

Not the author, but I have some shop experience.

As shown, it won't come apart. The plaster blocks access to all the hardware that attaches the tube to the base. If you make a smallish base for the tube, then you can attach that to the full base with removable screws, T-nuts, etc. This could be made to be completely internal to the tube. If you use flat head screws and countersink them, then they can be hidden underneath the base and still allow the base to sit flush on the floor.

Another way to do it would be add some bolts/washers/ nuts to the base so that the plaster weight will be solid to the base when cast. Then line the bottom of the tube with waxed paper, tape it in place, and use it to cast a "plug" onto the base. Then the tube can just slip down over the plug, and be lifted off when you need to move...might need a bolt to prevent rotation. Might want to wrap the rope before casting, as it might compress the tube enough to bind on the plug.


9 years ago on Step 11

Awesome instructable, I'll have to make one for my cats. I have a 14 year old cat I've had since 1rst grade and is still as energetic as a kitten and a 4 year old tiger that's 15 pounds and likes to climb so I think this might be perfect for them, the only thing is finding a concrete tube. They have them at ACE this size but $30 is a little pricey.

2 replies

Reply 3 years ago

Working on this project and the tube cost me about $7 at Lowes.


3 years ago

up! Amazing guidance for my problem, and gracefully executed by click here! I would definitely
recommend them to every single of you out there! They are really worth


3 years ago

QUESTION: in the supply list, it says concrete tube, and later in the post it refers to it as a cardboard tube. Which should I purchase if I want to construct this amazing looking post?

1 reply

Reply 3 years ago

Those tubes are actually used as concrete forms - for pouring a deck piers and the like (you fill the tube with concrete). If you go to the "big box" just ask them for "concrete form tube-cardboard" and you'll get what you need. "Sonotube" is one brand name, so is "Fast-Tube", another is "Quik-crete Form Tube". One caveat- there is a huge range in price - the really cheap ones are very thin and would not hold a fastener very well. Real Sonotube is about 1/2" thick and pretty pricey. Tip- sometimes foundation contractors or deck-builders will have chunks of the stuff left over from jobs and might let you have a chunk. Hope this helps.


3 years ago

This is a great project - just one minor note...the "elbows" are actually "corner braces" or "angle brackets." I know it sounds nit-picky and I don't mean to be - but elbows are usually some kind of pipe/plumbing fitting. I was a confoosed and I know what I'm looking for- just thought a noob would appreciate the actual name if they were searching out parts somewhere besides Lowes.


3 years ago

What is the purpose of the two narrow elbow brackets? They seem to duplicate the function of the first two wide elbow brackets. Thx.


3 years ago

I'm gonna try this. My cat is half maine coon and is a big boy. I might try wrapped the tube in heavy craft paper then hot glue the sisal to that. As it gets destroyed, I can unscrew the top, slide the paper/sisal off and put a fresh layer on.


3 years ago

After the cats eventually wreck some of the rope, is it possible to replace a length of rope and still have it look nice after trying to free it from the wood glue?


Just found this and am tempted to make one! My cats are limited to 1 room currenty but I'm not sure if they would climb really. Both choose to use the lower parts of scratch posts but that might be where they could reach as kittens. I agree about shop brought ones being very poor - 2 cat trees and in less than 2 years, both are wobbly now. Neither are tall enough for a full stretch, and the platforms are too small for both cats.

Only issue will be finding space in a room to put it. But fantastic idea and clear instructions


This is awesome! My lady and I will be making this for our two beautiful black cats who are almost a year old and the big guy Max needs some exercise. Seems a hell of a lot better than any expensive store bought post. So glad to see someone else looking after black cats. We kept the 2 black cats of a litter for the same reason. Plus they were the sweetest.


Your "bogus theory" isn't so bogus. Putting yourself into your cat's position is a sign you are a compassionate and evolved human caretaker. I would add that there are other common "training" methods that need to be avoided, such as: squirting water on a naughty cat, making loud noises to scare him away from scratching in the wrong place, and any other measures meant to intimidate him. These are just going to create a timid and scared animal. Also, though many folks think that merely rubbing a post with catnip will attract him to it and then to scratch it, I don't really like that solution either. Instead, I'd recommend playing with your cat around the post with a simple piece of string ( or even with a laser toy ). After all, one of the best things about our cats is the wacky and humorous way they chase and hunt ( I ALWAYS get a good laugh when my cats have cornered a mouse, and all the drama that entails! ). Also, let me congratulate you on your approach to the size and stability of your scratcher. These are critical to ending up with a really great scratch post. I always recommend wrapping a post with at least 150-200 ft. of 3/8" Brazilian Sisal Rope.


5 years ago on Introduction

This is an awesome Instructable: good photos and step-by-step instructions! The only teeny tiny quibble I could find is that I wasn't able to find the items on the Lowe's website using the provided part numbers. Also good: I wouldn't have thought of putting plaster in the tube for weight (I would have tried sand and had it slowly leak forever), so that was very creative :)


5 years ago

Cats also have scent glands in their feet so when they use the scratching post they are leaving their scent (marking their territory).


5 years ago

About how much did the supplies cost, minus the tools? This post looks awesome and addresses the issues most store-bought posts have like not being wide or tall enough.


5 years ago on Introduction

I love your story about your cats. I've got a black kitty girl who is almost 2 yr old, and spunky doesn't begin to describe her! But also is the sweetest thing, and she adopted my mother recently (who has never been around cats, doesn't really like them, and with my dad's recent death, has been pretty lost). Bella really is her personal watch cat ... and I'm going to make one of these posts for her (she might share it with her sisters, but not betting on it, so will get supplies to make at least two!). Thanks for a great idea.