Pebbles in the water

Oh my poor cats...   I've always bought Hartz flea spot-on; our local store hasn't had any for ages so I bought Bob Martins back in October.  My old boy Toffee (he's 15) started scratching about mid-November; he had some sore spots, I asked at the vets and they said if it wasn't fleas (I checked him: there was no sign of fleas at all) then it was probably a food allergy.  I changed his food, got all worried, kept checking him, gave him more Bob Martins just before Christmas - and lo and behold, found flea signs last week!  AND he has a bald spot where the Bob Martins was put on.  I had to wait til now to treat for the fleas as I had just dosed him with the spot-on, so today he's had a dose of flea meds, plus a flea collar, plus all his favourite spots have now been sprayed with flea treatment, AND my other cat Bailey has had a flea tablet which he was NOT IMPRESSED WITH (especially as I sat on his tail as I was holding him down).  

So I have one cat with itchy sore spots and a bald spot on his shoulders; and another cat who isn't speaking to me, and my house smells of flea spray which is not really nasty but... it's definitely a 'smell'.

Bob Martins.  Flea-friendly, apparently.