Perfect for both cats and dogs!
The developement of a sturdy thermoplastic (ABS) frame and a see-through poly vinyl flap with patented non-warping edges, ensure that this pet door will last. With a floating sill to ensure good closure and a strong molded ABS lock-out slide to restrict the pet's movements when necessary, this is one of the easiest to use pet doors on the market. The Ideal Pet Door with telescoping frame is made with a tamper proof mounting system and easy installation; it's the most economical pet door in the industry.

Dimensions:
Small: 10.63"L x 2.13"W x 7"H (5" x 7" Opening)
Medium - 14.88"L x 2.13"W x 9"H (7" x 11" Opening)
Extra Lg.: 18.63"L x 2.13"W x 12.4"H (10.5" x 15" Opening)
Super Lg.: 23.88"L x 2.13"W x 17.9"H (15" x 20" Opening)