Buying guidanceFit the pet, then fit the frame
Match the replacement to the existing frame rather than measuring a curled or stretched flap casually. Use the original SKU, order record or verified frame size when available.
Use manufacturer dimensions and the original frame identity whenever available. Old flexible parts can stretch, curl or be trimmed, making a casual measurement unreliable. Covers depend on frame size and load direction; magnets and strikes depend on their mating hardware; wall tunnels and buildouts depend on construction depth. If identification remains uncertain, compare multiple dimensions and photos before ordering instead of drilling, cutting or modifying a new part to imitate the worn one.
Dog Doors Depot carries 11 standard flap sizes from Small Medium through Giant, including tall intermediate sizes that separate height from width. Use the individual animal rather than the label as the decision-maker. After the clear opening is selected, compare the exact product variant because model families can use different frame, tunnel and cutout relationships. If every standard choice creates a meaningful compromise, use the custom-size workflow and keep the submitted dimensional basis attached to the order.