Color Out of Space: An aging hippie named Ezra had a black cat named G-spot (As in "pussy" cat). The cat was infected by contaminated water caused by radiation from a meteor and mutated into a hideous cat-like animal.
Count Yorga, Vampire: A young woman named Erica Landers, having only recently been turned into a vampire by the Bulgarian count, Yorga, massacres a kitten for its blood.
Eight Legged Freaks: Deputy Pete Willis and his wife owned a spoiled cat named Zeke, that would not eat cat food. During some renovation work, the cat got into the drywall and the Willis' tried to coax it out with a can of cat food, telling the cat that it was actually tuna. A mutated spider of considerable size got into the drywall and fought with the cat. The ferociousness of their battle was so intense that it actually left a cat-shaped imprint in the drywall. Sadly, the spider was the victor in this grudge match.
Ghost Whisperer: Melinda Gordon once had a terrifying dream wherein she gave birth to a litter of demonic cats. [1]
Werewolf of London: Wilfred and Lisa Glendon owned a pet cat. On the first night of the full moon, Wilfred Glendon began to go through his first transformation into a werewolf. The cat took note of the early changes in his physicality and reacted violently.
Television[]
Buffy the Vampire Slayer: Spike used to play poker with a loan shark demon named Teeth, but rather than gamble with money, they used kittens. Spike was in-large to Teeth for forty Siamese. (BTVS: Tabula Rasa)