Season 4

A deaf and blind cat stops using its litter box and becomes hostile toward its owners and a new kitten; a couple puts their family plans on hold due to violent feuding between their dog and cat.

A woman and her two feuding cats move to a tiny studio apartment; a ferocious feline attacks a 95-year-old woman.

Bloodthirsty fights lead to urination and frustration; a couple are confused by their pet's odd relationship with a stuffed animal.

A stray cat with a violent side manages to pull on a woman's heartstrings; a cat attacks other felines.

Cat bully Buddy makes life miserable for fellow feline Lita; a kitty named Princess Puffy Pants urinates on everything.

A one-eyed cat with cerebellar hypoplasia torments another feline; a woman's cat urinates on anything and everything.

A cat marks everything in its owner's home; a new cat causes trouble for a couple and their older feline.

An aggressive cat worries an expectant couple; a woman who wants to become an animal behaviorist struggles with two fighting felines of her own.

A woman and her sweet cat are terrorized by a nasty feline; a Persian pooh-poohs the use of a litter box.

A cat-show contestant takes her aggression out on the judges; a man with Crohn's disease cannot stand his cat's constant meowing.

A couple want to move in together, but an uncooperative cat stands in the way of their plans; a demonic feline creates stress for a married couple.

A hellish feline destroys an Italian family's close-knit bonds; a woman moves in with a friend, not knowing that she owns a psychotic cat.

Rick's cat, Buddha, bullies his friend and roommate, Hector; a couple is kept sleeping apart by their cat, Dylan.

A man invites his girlfriend and her foul-tempered feline into his home; two cats that refuse to use a litter box threaten to doom a couple's five-year relationship.

A long friendship between three women is put at risk by the evil behavior of one's cat; a bad Bengal cat threatens to get her owner kicked out of her parents' home.

A shelter cat dubbed "Crazy Daisy" flies into rages and suffers from self-inflicted wounds; she-devil Gizmo's violent ways cause stress for a married couple who want to start a family.

Jackson revisits clients from the first four seasons of the show to see how they and their cats are doing, and also checks back on one of his toughest cases.