I have 3 squirrels,1 female 2males one of the males is losing his fur on his hind end and base his tail it's almost half on hind area? The other 2are fine they haven't been outside and are around 6 months old,i feed them a variety of fruit and nuts,that they'd forge for in the wild ,I'm worried. I'll be taking them to the vet in couple of weeks., but is there anything I can do now?