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 6-⅝"x7-¼"
- Medium 6-⅝"x11-¼"
- Extra Large 10-¼"x15-¾"