Kitty is 14 and hasn't had a problem with frontline or hairloss. It could be a skin infection causing hair loss or possibly an allergic reaction to flea bites. Flea collars tend not to work too well so it is best to keep using frontline. If his hair hasn't grown back despite not using frontline, it's probably not that causing the hair loss.

It might be a good idea to take him to the vets just to get it checked out.

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Owned by Ratty girls Hera, Athena, Boomer and Kitty the Cat
RIP Apollo and Starbuck, together again at the Rainbow Bridge. Till we meet again.