A dog in an animal shelter was diagnosed with parvovirus after showing signs of hemorrhagic diarrhea. Parvovirus is highly contagious and can persist in the environment for years. The document discusses managing the disease in the individual animal through isolation, supportive care, and antibiotics. It also discusses managing an outbreak in the shelter by isolating exposed animals, using protective equipment, thorough cleaning and disinfection, segregating young animals, reducing stress, and preventing future outbreaks through vaccination.