To determine the correct size door simply measure the width and height of your pet:
- Measure the widest point of your pets shoulder to obtain the width measurement.
- Measure from the top of your pets back (just behind his head) to the bottom of chest to obtain the height measurement.
- Small 6-5/8"x7-1/4"
- Medium 6-5/8"x11-1/4"
- Extra Large 10-1/4"x15-3/4"