Changes in appetite Stress can cause some cats to lose their appetite ... a tightly curled tail, or rapid tail flicking. Dilated pupils or wide eyes If your cat’s eyes look unusually large ...

A sudden sight, sound, or movement can trigger a cat to instinctively puff up. Cats can get startled by anything that appears out of nowhere, perhaps a shadow, a dust bunny, an approaching dog, or, ...

Generally speaking, a cat will stick their tail high up in the air when they're happy and confident. If that flagpole tail is quivering, it's likely a sign that they're super happy to see you.