This is quite difficult question to answer since no dogs are normally without tails they are ordinarily docked by the vet. However because of some imaginative crossbreeding lately, A change in a gene called the T-box interpretation factor T gene (C189G) represents normal bobtails in 18 breeds of dogs.
Those are the ones that would be ordinarily docked. Australian shepherds, corgis , boxer, Schipperke and such. Others do have narural bobtail without that particular transformation - dobermans and Rottweilers. Because of the rearing and backbreeding done to make this "characteristic" bobtail element I would be worried about other genetic irregularities as a symptom of these 'desired effects..
These dogs abandon tails, and they like it that way. While numerous dog breeds have customarily had their tails docked, these 7 breeds are conceived without a rear end. They incorporate the French bulldog, Boston terrier, Welsh corgi, and some lesser-known marvels, as well.
