Cats slap us with their tails for all types of reasons. Its a cute behavior, and its more of a gentle tap than a slap. From feelings of frustration to excitement and curiosity, your cat uses tail slapping as a communication tool to get your attention and let you know how its feeling.
Cats swish and flick their tails languidly when they're excited. A playful cat's tail often waves smoothly. Some biologists think that, in the wild, this motion mesmerizes or distracts potential prey. These motions can include the entire tail, but often involve a bent or articulated tip. Note that this flicking can quickly escalate or change to that of an annoyed cat.
Other signs of playful cat posture include eye contact, forward-facing ears, and lying down perpendicular to a target and extending paws, possibly with claws out. Cats thump and flick their tails intermittently when they're agitated. An agitated cat's tail may wave like a playful cat's tail, but the motion tends to come in bursts.
If you continue certain activities like, say, petting him, he may bat at you with a paw.
Other signs of agitated cat posture include eyes wide with pupils dilated, slightly turned ears and a crouched or tense body, possibly with paws raised. Cats wag and flick their tails vigorously when they're on the offensive. An aggressive cat's tail wag starts at the tail's base, fulling engaging the roughly 20 vertebrae in his tail. The tail is generally held fairly low, and sometimes it's flexed or puffed up. Proceed in whatever you're doing with caution, as your cat is in a tizzy and may strike or dash out of the room.
Other signs of aggressive cat posture include narrow pupils, turned ears, standing with body directly at a target, bared teeth and hissing.
Cats flick their tails idly when they're, in fact, idling. An idle cat's tail indicated a passing interest. If the cat is stoked, this stimulation may escalate to one of the tail flicks described earlier. It can also continue as a sign of rest and contentment, even in sleep. Some people think this flicking is a reaction to something in a dream.
Other signs of idle cat posture include normal or closed eyes, ears in a neutral position and an even-keel standing or lying posture.