Choosing the correct size door for your pet is not difficult.
Remember you can always get a door which is a little bit larger, but do not get
a door which is too small. Here are some guide lines and suggestions to help.
If you have more than one pet, you will need to focus on the larger dog.
Door Sizes
and Pet Weight:
If your cat is
smaller than about 15 lbs or your dog smaller than about 8 lbs, a flap size of around
5" x 7".
If your dog is
between 8 lbs and 35 lbs consider a flap size around 8" x 11".
If your dog is
between 35 lbs and 80 lbs consider a flap size around 10" x 15".
If your dog is
over 80 lbs consider a flap size of 15” x 20”.