Picture of How to find a break in an invisible dog fence
Recently I went into my garage to find the invisible dog fence transmitter beeping. After calling the company I was informed that this alarm meant there was a break in the fence, and that I should have them come out as soon as possible - because my dog would surely figure this out in a few days. And hey, for only $100 an hour, they would be happy to help! Long story short, they tried for an hour then told me the yard was too overgrown (half the yard is wooded) and they would have to come back in the fall when everything died back (2 months away). This made me swear that I would do it myself - but after digging up over 100 feet of wire and driving myself crazy for a few days, I had not found the break. Then I found this strategy on the internet (link) that cost me under $20 and worked like a charm. Hopefully this makes it clear for everyone else and saves you some money and frustration. Good luck!

Step 1: Verify the break

Picture of Verify the break
First thing to do is make sure that you do indeed have a break. There are a few ways to do this. On my unit, two wires run from the transmitter to the perimeter fence. Disconnect these wires from the transmitter and put the ends of a paper clip or small piece of wire into the jacks where the wires had been connected. If the alarm is silenced, the transmitter is working properly and you have a break. Another way to verify that there is a break is to use an ohmmeter and check the resistance on the disconnected wires. If there is no resistance the wires are continuous and there is not a break, meaning you may have a problem with the transmitter itself.
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airedale011 month ago

I had a lightning strike that fried my PetSafe transmitter so I bought a new one. I followed all the steps and even tried turning the new transmitter up all they way as suggested in the comments. I thought maybe I had a break in the fence so followed all of these steps. Everything worked great, plugged in the RF Choke, hear the frequency on AM radio but cannot find the break. I've walked the fence three times and have strong signal the entire way around. Even re-did my splice just in case. Will a lightning strike cause some other problem. I'm considering just sucking it up and putting in a new fence line. Any suggestions welcome....Thanks

csheerin112 months ago

Even thought Radio Shack local store said they had 3 RF Chokes...I drove there to find they had NONE! Tried making my own - didn't work. Finally just reset the switch on the side of the transmitter from High to Low and reset the dial to 5.... back in business. Possibly sent it into alarm state from the lightning storm we had the other day! Anyway... Only wasted 2 hours before doing that....(I also redid all my splices even though when I pullled each one apart and put them back together nothing changed on the open circuit alarm...)

CharlesW92 months ago
Kgburke 4 months ago
I followed all the instructions but I cannot get the transmitter to stop beeping.
How long should it take to travel the loop?
Its immediate. Make sure you connected the electric fence wire tightly to each rf choke lead
rob.shakal4 months ago
Incredible! Thank you so much for this post! ! Worked like a charm. Under $2 for rf choke. Signal got weak in one section. Dug one foot each side of weak spot. It was a previous splice I had fixed 5 years ago when kids broke line digging for worms. Splice had broke. Redid and up and running again!! Took 15 mins. Saved hundreds.
lee.wimmert made it!4 months ago
Thanks this worked perfectly. There is a radio station at 600 where i live so a connected a 20 ft loop from some wire that i had. Thus way i could identify the exact sound. the sound get faint near the break so i put flags in the ground on both sides of the break at the last point where i had a strong signal. the break was in line between the flags. It was not very deep

I bought the rf choke from radio shack. At first it seemed ok but a few minutes it my transmitter shut down. When I unhook the choke it works again. Any advice.

yes, there are instructions on your unit on how to reset it. The same as resetting your cable on your T.V.. Also if you have a large yard, you have to set it at six or about so the electric is strong enough to pulse through the entire length. Turn it up until it stops ringing, then very slowly, turn it down until it starts ringing, then turn it a centimeter.

Kgburke  angels414 months ago
I tried turning up to 6 and then even higher and it still beeps.
BN34 months ago

What a great instruction! I followed this step by step and fixed the problem. After a period of time that the system was inactive, the battery in the collar needed to be replaced. Just make sure your battery is good so you can check the system accurately. Thank you very much for posting this.

hville1 year ago
Do you have to unplug the transmitter from the wall outlet to connect the RF Choke? If so, do you plug it back in before listening for the signal break?
angels41 hville7 months ago

of course it has to be plugged in. Don't worry it will NOT Shock you!

I unplugged mine before hooking up the RF choke and fence wires. Probably just turning it off would be fine. Then you MUST turn it back on (and plug it in if unplugged) to listening for the signal from the fence wire.

ScottH511 months ago

great idea, can't wait to try it. QUESTION???? can't you just use the collar instead of an AM radio. Not sure I even own a handled radio anymore. Gonna try it and see. BTW - you are saving me loads of time and $$$$ THANKS!!!!!!!!

angels41 ScottH57 months ago

nope have to have radio. Hardest part is finding the radio, the rest is a piece of cake.

ConnieD1 ScottH511 months ago

The collar doesn't work when you attach the RF choke.

mary.l.conrad9 months ago

I can't seem to find the correct channel. My radio goes to 170. I scroll through the 54 through 65 area which I assume matches to 600? I just get static. Can anyone suggest something?

Static is what you want. The static fades when you get close to the break. My break was two ahead of where the fading started. Use headphones if nessicary.

cuyler.lanier8 months ago
Does this work if the break is where the wires are twisted together?

Of course, just go back six inches on each side and put in a new piece of wire.

Thank you so much. The paperclip method solved the immediate crisis and I can now focus on fixing the whole system. Your guide has empowered me to get this done.
msheppard9 months ago

Totally worked. Hard part is hearing the tone generated. First try I had to quit because the wind was too noisy. Dug up the wire up a foot or so from where I thought the signal dropped - and I was within 2 feet of the break. Turns out I actually had 2 breaks - one another couple feet down the line. Tied both up and now the dogs are getting their shock treatment.

must use head phone for accurate reading/

Beach008 months ago

Wow it worked. This is crazy. I was thinking no way I'd be able to find the break and my wife thought I was insane. I couldn't get my hand held radio to work so I used my Sony walkman headphones. My neighbors must have thought I was weird walking around the yard with headphones in my ears and the radio hanging an inch off the ground. I could tell the slight change in static on channel AM 600.

Thank you for the post you save me a lot of $$$

brodiemac10 months ago

This worked great! While my fence didn't have a break, it did have a short that caused it to fail. This method didn't find the exact location, it did narrow it down to a length of fence where I knew there was a union between to sections of wire. Once I located that, I found the short and was able to fix it. Thank you!!!!

ConnieD111 months ago

I have an Invisible Fence ICT 700 Transmitter. I did have a problem until I was able to locate the Operation and Installlation Manual for this on the internet. I was afraid I was going to break the signal field wire connectors by pushing on them too hard. Once I figured it out the rest was easy. I did have to have the AM radion on the ground almost to detect the wire. It was no problem since I was using head phones that had a long cord. This repair saved me at least $98!

skram19921 year ago

I have a PetSafe Stubborn Dog fence. It has been installed for about two years. After reading all the comments and checking other sites, I was a little apprehensive that this would work, but thought I would give it a try. Spending $2 was a lot better than ordering a locator for at least $50 and waiting for it to come in. I'm pretty sure my dogs would have figured out the fence wasn't working soon. Hooked up the choke and tune the radio to around 600 on AM, it instantly picked up the transmission. Hooray! I then went outside and started walking the 1300 feet of fence. I really don't know how far the signal will reach, it was still transmitting at about 500 feet. I was pretty sure I was in the area where it was spliced so I started digging. My son then took the radio and walked to see what he could find. The signal was good and then he discovered our problem. Something had chewed and broken the wire. I didn't see that on my two visual checks, don't know how I missed it. We also used the radio and with it stopped when going over the cut part. We had an easy fix from there, hardest part was covering the wire I had dug up. Time and effort wasted on my part, but good news is the choke and radio worked with our fence. Now I am prepared if we do have an underground break in the fence. Thanks for sharing this solution. It definitely is better than ordering the detector from the company.

PJMc21 year ago

Before you go through all this, I'd suggest that you double check your transmitter. I have the Radio Fence Pet Safe RF-1010. It started beeping so I was certain that it was a line break. I did all these steps, and spent hours, then simply turned the dial all the way clockwise to 10. For some reason, the sensitivity changed from around 2 to 7.5 on the unit! Below 3, beeping, above 4 it went away! It now works like it did before, and it looks like the problem is solved.

stepshadow1 year ago

I made my own RF choke since I live in a rural area and I couldn't get a Radio Shack RF choke for at least a week. Quite easy to make one yourself. I used the calculator on this website to make an air core RF choke.


I made mine using a spool from some wire I had bought. It's almost 2 1/4 inches long, the diameter is about 3/4 inch before any wire is wrapped around it. Then I counted the number of turns of wire I put on it as added wire. I think the final "average" diameter was a little over an inch so I used 1.1 inches as the diameter. According to the calculator, I needed about 100 turns (slightly less). I hooked it up to the transmitter along with the underground fence wire. It worked like a champ. Not very pretty, but functional. As I approached the wire break, the signal became very weak on the AM radio. The radio needed to be held close to the ground.

mlighthouse2 years ago
This worked beautifully! I wish I'd found this last summer, when my husband and son spent hours locating the break(s). We only had to purchase the RF choke from Radio Shack for $1.49. We already owned an old AM/FM radio, so no extra expenses. Another poster mentions a device made for this, but it costs $150! I'll stick with the $1.50 and AM radio! Our biggest problem is not with splices but more with a neighbor with OCD that likes to run his edger and rototiller close to our property line. This last time he was adding on to his garage and tried to bury our wire with his shovel; he broke the wire twice! I hope the fence still works if we bury it in conduit this time!
I have an Invisible Fence brand and so does my neighbor (it was installed when I bought the house). Right after I moved in I was aerating the yard and cut both his and my fence. I called a friend in the landscaping business (who told me he cuts/repairs them almost daily) to come out and make the repairs. He said he could make it but would take a couple of days. The next morning my neighbor had the Invisible Fence people come out and fix his fence and then stuck the $150 paid invoice in my mailbox with a note saying I owed him the money. My friend came out the following day, had the 4 breaks in my fence repaired in less than 30 minutes and didn't charge me a dime. A few weeks ago, my neighbor had tree surgeons topping trees in his back yard and when the trucks pulled out they swung wide into my yard and my fence started beeping. I didn't have time to deal with it so I unplugged and kept the dog inside. I'm now trying to repair it myself. I guess that is the more neighborly thing to do???
riplefct1 year ago
I need some help. I have followed all the instructions. Have the choke on. With it off, I have beeping. With it on, beeping stops. With the choke on (exactly as above), when I wave my radio over the wire right at the box (above) I hear the signal. But the rest of the wire has no sound at all. It is as if the signal is not going down and out the line. I can trace the wire out of the house, and even there near my garage I hear no sound in the radio. Any advice appreciated.
pamsy631 year ago
Besides being much easier than the Petsafe instructions these instructions worked like a charm. I located the break (probably due to manually removing weeds in the grass) and fixed it in less than 2 hours. What a relief after 2 weeks of our dog jumping the fence to chase rabbits!!! Thank you so much!
By the way my system is a Petsafe UltaSmart inground fence system, so it does work on it.
monsoon2251 year ago
Worked perfectly. I too used a bolt and copper wire. Radio frequency was a little off until I noticed a station coming in tune each time I was over the buried wire. Found the break on the first shot. Thank you!
wadams41 year ago
In further looking over for options on the internet, I've found the $100-$200 wire break detect products range limited to 1000 ft. The Dogwatch team who did the repair used a Greenlee 501 product where the range goes to 4000 ft. (A distance that would cover a range of shapes for 6 acres). The only downside is the product is >$600 and a questionable investment I'm mulling over, for only home use with infrequent issues. http://www.greenlee.com/products/TRACKER-11%2540dCABLE-LOCATOR-(501).html?product_id=15377
wadams41 year ago
In further looking over for options on the internet, I've found the $100-$200 wire break detect products range limited to 1000 ft. The Dogwatch team who did the repair used a Greenlee 501 product where the range goes to 4000 ft. (A distance that would cover a range of shapes for 6 acres). The only downside is the product is >$600 and a questionable investment I'm mulling over, for only home use with infrequent issues. http://www.greenlee.com/products/TRACKER-11%2540dCABLE-LOCATOR-(501).html?product_id=15377
wadams41 year ago
I have a dogwatch system for 6 acres. I tried the RF Choke method with a AM radio and due to size of property, could not make locate the break. The signal became too weak at the longer distances. I tried the method with Dogwatch transmitter set to FM settings (on back of unit), the signal pickup is on AM radio. I also tried the method with transmitter set to AM (on back of unit). On FM, the signal is loud interference, on AM the signal is a pulsing one with interference. I gave up after 3 days and called in Dogwatch to find/repair the break. They have pro grade wire break detection equipment, amplified signal transmitter (independent from the fence transmitter) and a receiver with very sensitive pickup. They were able to walk the entire perimeter with a strong signal, no fade out like the AM/RF Choke experienced, in the wire up to the break. Overall, I appreciated all the info to try a DIY and save $$.

Knowing the chance of having more fence breaks, I'm looking into the DFNA device set (and will look at the buying in China to save $$$) . What I'm trying to sort out is whether the unit works up to 1000 ft or up to 3000 ft. In different places on the web, it is listed as 1000 or 3000 . Would appreciate to see more field experience in this thread about property size of length of wire.

Also, any other methods to save $$ will be good. E.g., make your own amplified transmitter that can be picked up on AM band for sizeable properties.

The sequence of pics for the post are great for newbies in trying this out.
FWIW, at radio shack, bought the choke for $1.39 and AM/FM small radio for $14.99 .
Cost here in central MA for Dogwatch fix and repair is $100 which includes upto 2 splice repairs (with materials), more fixes would be $12 each.

Separate issue, but somewhat related....trying to find something. One of our dogs lost a collar with the receiver. Dogwatch has a wide-spread scanner unit to detect it...a future visit. Dogwatch provides lifetime replacement and or rebates for damaged units. So even though I had to buy another receiver, when I find the lost one, I will get reimbursed.
mx007912 years ago
I followed the instructions and was able to find a signal where the invisible fence begins and down about 1/4 of the fence line. going both directions I lost the signal outside of that section and wasn't able to find it again anywhere in the remaining 3/4 of the fence line. If there is more than one break, is this what you'd expect?
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