PARVOVIRUS -- Canine parvovirus is an acute, highly contagious disease of dogs that was first described in the early 1970's.  The disease is transmitted by oral contact with infected feces.  Parvo affects dogs of all ages, but most cases occur in puppies 6 to 20 weeks of age. 

Parvovirus is characterized by severe, bloody diarrhea and vomiting, high fever and lethargy. The diarrhea is particularly foul smelling and is sometimes yellow in color. Parvo can also attack a dog's heart causing congestive heart failure. This complication can occur months or years after an apparent recovery from the intestinal form of the disease. Puppies who survive parvo infection usually remain somewhat un-healthy and weak for life.