YOU HAVE PARVO. THOUGH BY ACCIDENT, THE MYSTERY OF GOOFY'S SPECIES IS FINALLY REVEALED.
A lot of people have always thought he was a cow. If you watch the original cartoon “Steamboat Willie” I think it was called, he is wearing a yoke around his neck. Almost makes no sense that he is a dog and so is Pluto. I think he just morfed into a dog over time.