The domestic cat is scientifically known as Felis catus, and this species is one of the most popular companions worldwide. Indoor cats typically live between thirteen and seventeen years, with some reaching twenty or more, while outdoor cats usually have much shorter lives because of increased exposure to disease, predators, traffic, and harsh weather. Across the major cat registries, including the Cat Fanciers' Association (CFA) and The International Cat Association (TICA), somewhere between forty and seventy breeds are recognized, ranging from the popular Persian, Maine Coon, Siamese, Ragdoll, British Shorthair, Bengal, Sphynx, and Scottish Fold, to the mixed-breed domestic shorthairs and domestic longhairs that make up the majority of household pet cats.
Adult domestic cats typically weigh between eight and ten pounds (3.6–4.5 kg), though weight varies widely by breed and individual. The Maine Coon holds the title of largest domestic breed, often reaching fifteen to twenty-five pounds, while the Singapura is among the smallest, usually weighing just four to eight pounds. Special breed considerations include hybrid cats, which are mixes with wild species such as the Bengal (a cross with the Asian leopard cat), and may require specialized care. There are also subtle differences between similar long-haired giants, like the Maine Coon versus the Norwegian Forest Cat, in both body shape and origin.
Kittens go through a remarkably rapid developmental sequence: their eyes open around seven to ten days, they begin walking at about three weeks, start play behavior at four to five weeks, and are typically weaned between six and eight weeks. The critical socialization window runs from two to seven weeks of age, during which positive exposure to people, sounds, and surfaces shapes lifelong temperament. For emotional and behavioral well-being, kittens should ideally remain with their mother until ten to twelve weeks of age. From there, life unfolds in stages: kitten (0–1 year), young adult (1–6), mature (7–10), senior (11–14), and geriatric (15+).