Litter pans are a problem. Especially when you have a large cat who can't fit in a small litter box and a dog who considers cat poop a delicacy. It's been a struggle to find a commercial litter box the cat can enter and the dog can't. As a result, I decided to make my own using 2 storage crates I purchased from Wal-Mart for around $20. The smaller crate sits inside the larger one creating a "foyer" so dogs can't reach the litter pan. The roomy crate is large enough even for big male cats who have poor aim.
"Dog Proof" may not be as accurate as "Dog Resistent" or "Dog Challenging", but so far it has worked well in our household. In fact, our dog has given up on raiding the litter pan so I consider it a complete success. We have large retrievers who are much too big to fit through the doors, although small breed dogs could walk into the litter box just like a cat. By altering the size of the door openings, however, this design should accommodate many cats & dogs. Another feature of having a box with a "foyer" is most of the litter on your cat's feet will stay inside the large crate as they exit.
Let me show how to build this inexpensive litter box for your cat...and not your dog.
Step 1: Stuff you'll need ...
This project requires very little in materials and tools to complete. Here's a list:
30 gallon storage crate
18 gallon storage crate
The 2 crates need to be similarly shaped so they seat nicely together.
1 1/2" hole saw & drill
4 wood screws
Small piece of mat or carpet