For the past week or so when ever I pet or brush Emmett around his back hips and his tail he tries to bite me. He doesn't look to be in pain. He's also acting normal in every other way. I don't know if he's aquired a ticklish area, or if he's hurt. As I said before he's still the same in every aspect. He doesn't limp, he runs around and plays. Purrs. I wondering if I should take him to the vet about this or I shouldn't worry. Any suggestions?