My mum has a gorgeous red persian called Sam who is about 15 years old now. Being a persian he moults a alot, but over the past year he has gone bald around the neck where his collar was.

We thought it might be the collars, but he hasn't had a collar now since we first noticed it at the beggining of the year and he's still missing fur, its not grown back. We are assuming that its the frontline flee drops that we use, but my mum is reluctant to switch to a collar for him as its just more chemicals. My mum has just decided to not treat him although he gets them quite often.

Has anyone else had this problem with frontline? And does anyone have any recomendations for other flee treatments?