I'm having the same problem with my baby Sophie. She has a head and front half full of hair but her hind end and back legs look bare. I mean theres hair there but its really thin. I've taken her to the vet and he says he cant find anything wrong with her, they've done test after test but nothing.
I mean she dosen't have fleas and there haven't been any problems with her skin or her acting differently. I'm about at my whits end with it. Not sure whats going on, I'm not getting answers from the vet and I'm just worried there might be something wrong. Then again I have a tendency to worry over little things but this is my baby I'm talking about.