Large Size Plastic Chubby Kat Inside Frame. Also Fits Medium Pet Flap and Hefty Kat Models
Chubby Kat/Hefty Kat - Replacement Inside Frame
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To determine the correct size door simply measure the width (A) and height (B) of your pet.
(A) Measure the widest point of your pets shoulder
(B) Measure from the top of your pets back (just behind his head) to the bottom of chest.
FLAP SIZE DETERMINES ALL REPLACEMENT PART AND PET DOOR SIZES: 5"x 9-1/4"(S), 7-1/4"x13"(M), 9-3/4"x17"(L/XL), 15"x23-1/2"(XLG/SL)