While many dog breeds have had their tails docked. These other breeds are born without tail. Genetic mutation is responsible for the natural bomb tail seen in this breed.
This breed include: Australian Shepherd, Brittany Spaniel, Croatian sheepdog, Schipperke, French Bulldog, Pembroke Welsh, Rottweiler, Boston Terrier, English Bulldog, Brazilian Terrier, Karelian Bear Dog, Mudi and many others.
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.