The Sphinx cat, bred from a Canadian mutation, is virtually hairless and has a damaged spine which results in a hopping walk.

The crop pigeon is bred with an over-sized crop and absurdly long feathers on its feet. The crop can't be cleaned naturally and the bird finds walking difficult.

Position canaries are bred to resemble the figures 1 and 7. Parts of their bodies are featherless and their overstretched tendons mean they shift continually from foot to foot.

The munchkin cat has short hind legs and three-inch front legs. It can barely jump, can't groom itself and suffers from premature aging of its long spine.

A German breed of lop-eared rabbit has ears as long as its body, making walking difficult.

Persian cats are bred to have 'piggy' faces. The nose is little more than a stump.

The shar pei, a dog designed in the U.S. from a Chinese strain, is bred for its wrinkles.

Mutant goldfish are deliberately bred with large growths on their faces.