Hmm thats wierd, our dog had been licking her paw and chewing on it for a while and so we called he vet and asked about it and they said she could have allergys.....we stopped using the carpet powder cleaner (you know, the stuff you sprinkle one the carpet before you vacuum to make the house smell good?) That we used to use and switched to a differnt one and she has stopped licking/Chewing.

Maybe your cat could have alllergies ?