Her tail is all twitchy

One of the first subtle signs that your cat is mad at you is when you see her tail placed low, swishing quickly back and forth, from side to side, says Emily Parker, cat behaviour expert at Catological. “Whenever you see the tail twitch, stop whatever it is you’re doing that is upsetting her, give her some space, and back off for a while until she calms down,” she explains.
He pees on your clean laundry

Your cat hasn’t had an accident since he was a kitten, and now all of a sudden he’s weeing all over the house? It’s a sure sign he’s distressed, says Linda Campbell, a registered veterinary technician specialist in behaviour. An angry cat most often urinates on soft surfaces like piles of laundry, sofas, or yes, your bed, she says. It’s important to take care of this problem early, before it becomes a habit; talk to your vet if you need help stopping the inappropriate eliminations, she adds.
She refuses her favourite meal

When a cat is upset she may eat less or even refuse to eat at all, Campbell says. Often this is a reaction to a new or unfamiliar situation, a change in routine, or a big event at home, like the birth of a new baby, she says. Keep a close eye on this one, however, as it can also be a sign of illness. If she won’t eat for more than a day or two, take her to the vet – it could be a sign of cat cancer.