The Small (20"x20") for cats or small dog breeds up to 11lbs.
Example breeds: Pomeranian, Chihuahua, Bichon Frise(small), Shihtzu(Small), Maltese, Yorkshire Terrier, Toy breeds.
The Medium (24"x24") bed is suitable for dog breeds up to 25lbs.
Example breeds: Bichon Frise(large), French bulldog(small), Boston terrier, Shihtzu(Big), West Highland Terrier, Cavalier King Charles, Jack Russell(Small), Miniature Schnauzer(Small).
The Large (28"x28") bed is suitable for dog breeds up to 39lbs.
Example breeds: Cocker Spaniel, Jack Russell(Large), French bulldog(large), Miniature Schnauzer(Large), Bedlington, Beagle.
The X-Large (31"x31") bed is suitable for dog breeds up to 55lbs.
Example breeds: Bulldog(small), Staffy, Boxer, Lhasa Apso, Poodle(Large).
The XX-Large (39"x39") bed is suitable for dog breeds up to 90lbs.
Example breeds: Bulldog(large), Pug, Pitbull, Basset hound, Border collie, Kelpie, Labrador, Rottweiler, Golden Retriever, Dalmatian, Whippet. German Shepherd(Small), Weimaraner, German Short Haired Pointer, Shar pei, Husky.
Note: All dimensions are measured manually with a deviation of 1 inch.
Instructions & Care