People are usually the ones turning into memes, but they aren’t the only ones. Four-legged creatures of the domestic variety, especially take-no-prisoners cats, are also prone to fame and recognition. Here are three of the most popular pets who have claimed Internet stardom. 1. Grumpy Cat: Grumpy Cat is the screen name — if you can call it that — of Tardar Sauce, an Internet celebrity who happens to be a Snowshoe Siamese cat.