I have two cats who have regular flea treatment every month with Advocate, the last one was 3 weeks ago. On Monday I noticed a flea on one of them and when we combed them found quite a few, they are groomed regularly and we haven’t seen any until recently, since then we have given them a bath with flea shampoo, hoovered regularly, sprayed Indorex and combed them with flea combs every day and we are still finding numerous fleas on them, any other ideas? I phoned the vets and they just recommended everything we are doing, they said they could change the flea treatment but the one they are on was the best