There are two main types of dog enteritis. One is primary gastroenteritis: it is mainly caused by uneven hunger and fullness during the feeding process, eating food that is not easy to digest and damaging the gastrointestinal tract, or accidentally taking irritating drugs. Caused by; second, secondary gastroenteritis: refers to the disease when certain infectious diseases (such as canine distemper, canine parvovirus) and parasitic diseases (such as hookworm, coccidiosis, whipworm) gastroenteritis caused.