Okay so my cat is about 8months old and Im having some real problems trying to deflea him! So far have frontlined (with the spot on stuff) him mid oct - it made no difference, so 3 weeks later frontlined him again, still no difference - you could see them running through his fur. Spoke to my friend who suggested the frontline spray so coated him in that and literally fumagated the flat, that was on monday - just found two more fleas on him!!! They are indestructable!!! Am going into the vets tomos to ask advice, but has anyone else had experience of this?!!!