Is there such a thing as breast cancer in Guinie pigs? I think Mr. Wheekers (long story, he's not mine, yet) might have it. His back breast (is that even what you call it on a male, LOL) is in larged, very large, about as big as a queter and if you stood the quater on it's side probly that fat. It also is a hard lump. He seems normal, eats his veggies and pellets. He is 4 years old. Do you think this could be cancer???
Ashley