犬瘟热，又称犬瘟、狗瘟， 是一种病毒性疾病, 对于犬科，鼬科，臭鼬科，鬣狗科，猫熊科，浣熊科，鳍足亚目和一些灵猫科和猫科的动物（但对于家猫没有影响，猫科动物犬瘟热或猫泛白细胞减少症是只对猫有影响的另外一种疾病）有影响。这种疾病在国内的宠物，如狗和鼬身上很常见，同时它也可以感染野生动物。它是一种属于副黏液病毒科的单链RNA病毒，因此是麻疹和牛瘟的近亲。 尽管在很多地区进行了广泛的疫苗接种，但这种疾病仍然属于狗的主要疾病之一。

Canine distemper (sometimes termed hardpad disease in canine) is a viral disease that affects a wide variety of animal families, including domestic and wild species of dogs, coyotes, foxes, pandas, wolves, ferrets, skunks, raccoons, and large cats, as well as pinnipeds, some primates, and a variety of other species. It was long believed that animals in the family Felidae, including many species of large cat as well as domestic cats, were resistant to canine distemper, until some researchers reported the prevalence of CDV infection in large felids. It is now known that both large Felidae and domestic cats can be infected, usually through close housing with dogs or possibly blood transfusion from infected cats, but such infections appear to be self-limiting and largely without symptoms.