Why do cats act weird when you scratch the base of their tail?
Cats act weird when you scratch the base of their tail because of highly-sensitive nerve endings clustered at the tail’s base. A few gentle strokes might be soothing at first, but excessive tail petting could be overstimulating or painful. This scratching may mimic a sensual response in females.
Why do cats like being patted on the bum?
This is basically because a concentration of nerve endings make your cat’s butt the best place for them to get maximum pet-age for their efforts. The sensation of being scratched or petting stimulates the nerve endings and helps your cat feel happy and relaxed!