A dog's breasts bulge like chicken breasts, which may be caused by nutritional imbalance. If your dog's food lacks vitamin D, calcium and other nutrients, it may lead to skeletal dysplasia, which may lead to chest deformity or protruding chest. Especially for puppies less than one year old, their bones are mainly composed of cartilage. If the supply of vitamin D and calcium is insufficient at this time, osteomalacia may occur, causing the connection between the chest ribs and the sternum to be inverted and the sternum to be lordotic.

However, some dog breeds such as Boxers, German Shorthaired Hounds, and Pugs are born with more prominent breasts. Breast, this is one of the breed characteristics and is not a big deal.