Canine parvovirus infection, called “parvo,” is an extremely contagious disease of domestic dogs – especially puppies and unvaccinated adults. Canine parvovirus (CPV) affects cells lining the digestive tract. It is shed in infected dogs’ feces for several weeks. Parvo is spread by oral contact with infected fecal matter, which can be on a dog’s fur or feet, in a crate, on a bed, shoe or carpet or on many other objects. Dogs that are young, immunocompromised, stressed or sick are especially vulnerable. Infected dogs shed CPV in their feces before they show symptoms of sickness, which is why parvo is so highly contagious. Signs appear within 5 to 10 days after infection and involve sudden, severe gastrointestinal distress. Dogs with parvo have profuse, foul-smelling, bloody diarrhea and profound abdominal pain. They vomit, develop a high fever and lose weight. Many go into shock, collapse and ultimately die.