Canine distemper is a highly infectious, often fatal, preventable, multisystemic viral infection of dogs, characterized by fever, anorexia, lethargy, and variable respiratory, GI, and late-onset neurologic signs. Diagnosis depends on recognition of characteristic clinical signs in an at-risk dog, followed by laboratory detection of the viral antigen or antibodies against it. Learn more: https://mrkmnls.co/40H438P | The Merck Veterinary Manual