Button had a bald spot on the top of his head, one on his chest, and right on the bend of his elbow-bone when we first got him. The vet said it was a fungus and gave me a bottle of Miconosol to dab on it 3 times daily. Over time the hair grew back and they dissapeared. Elmer never "caught" it from him or anything. He has not had any trouble since.