Losing hair

by Leah
(South Africa, Cape Town)

I have two Jack Russells, my boyfriend one. Now his dog has 2 little spots on his back left thigh/leg. These spot have lost some of their hair, and it seems is losing more. He does not have any scars on the spots. Do you think that a tick bit him, died, and now the hair is falling out there were the tick bit him? We are also giving him livers & kidneys(Cooked) every 2nd day to eat do you think too much of this could cause this? I just do not know how serious this is? And am worried that he will lose more hair?