Hello and
to TSB. First question is
what is his diet? There are several things that will cause hair loss, but diet is related to almost all of them.
That said, I don't know what the laws are in BC, but you need to see if you are allowed squirrels where you live. If you take him to a vet where squirrels are not allowed, the outcome will not be good. That said, I had my Rex neutered and it was the same price as a cat. Make sure you take him to a vet that is familiar with squirrels though, as a simple blood draw can stress them enough to stop the heart!