There are many causes of infectious enteritis in the dog. Canine parvovirus and canine distemper virus (CDV) Campylobacter spp, Salmonella spp and clostridia are usually associated with milder disease. Other agents (e.g. caliciviruses, a herpesvirus and enteroviruses; see Miscellaneous Viral Infections ) have also been described in the faeces of dogs with diarrhoea, and it is possible that some of these may be responsible for some cases of enteritis.