Though opinions differ, a good median time range for bathing your Bullypit is every six weeks. Since the breed has a short-haired, single-layered coat, its skin is more exposed than dogs with longer and/or double coats--so those living in very sunny regions may want to bathe their American Bullies more often to relieve any sunburn.
Owners and groomers also debate what's the best shampoo for American Bully dogs, but overall, the best kind is one that moisturizes the skin and gives the hair plenty of shine. Burt's Bees Oatmeal Shampoo for Dogs is a favorite brand among owners.) In any case, make sure the shampoo is made for canines, as the kind made for humans usually has perfumes and other chemicals that severely irritate a dog's skin.
You can bathe your Bullypit either in a bathtub or in an outdoor kiddie pool using a garden hose. First give the dog a thorough brushing, then wet the coat completely; apply a quarter-sized amount of shampoo to the dog's back, then lather well, working downward. (And don't forget the legs, underbelly, and tail!) Finish lathering by using a washcloth on the head, face, and ears to avoid getting soap in your Bullypit's eyes. Rinse thoroughly. (Conditioner isn't necessary, but if you choose to use it, repeat using the steps above.) Towel-dry, then give the coat another quick brush-through to make it look shiny and neat.