If you're looking for anime similar to Three Cat Cookies, you might like these titles.
The official music video for La la la from the album With, by Standing Egg.
It is the holiday season. A young man encounters a drunken cat that belongs to an old man in an alleyway. When the young man later goes to a restaurant, he learns that the old man has trained his three cats to sing. The young man is impressed and learns the secret behind the singing cats.
The anime's story centers on a cat named Maru, adopted by a girl named Anna from a shelter in Matsuyama city. Loved and well fed by the family, Maru gets rounder and fatter every day, spending most of his day sitting by the window and looking at the garden outside. When the family gets a new cat named Cerisier and begins doting on it, Maru gets jealous. In a fight with Cerisier, Maru is hurt by the family's words to him, and follows the advice of another cat to leave and see the world.