Hi My cat keeps pulling out all the hair on her belly and legs. I went to the vet and they said it is an allergic reaction of some sort and gave her a shot of medicine. I am not sure what it was. But after the shot she was very withdrawn. She didn't want to be touched. She turned mean. Then about 2 weeks later she was fine. Back to her old self. But she is biting the hair again. I don't want her to have that medicine again but i don't know why she is doing it. She is 4yrs old and a calico.