Quite a few pet owners choose cats over dogs because "cats are so clean." And it's true: a normal cat can spend as much as 50% of their waking time grooming itself (or another cat). As a result, cats are typically very clean animals, though in some cases grooming can become a form of obsession.
The mother cat's first job after giving birth is to remove the amniotic sac, then lick the kitten with her rough tongue to help stimulate its breathing. Later, when the kitten begins nursing, she will stimulate the kitten to urinate and defecate by licking its hind end.
Kittens, emulating their mothers, start self-grooming by the time they're a few weeks old. If they are part of a litter, they are likely to lick and groom one another as well.
Outside of simple cleanliness, grooming has a number of purposes. Here are some of the most important.
Cats will instinctively lick areas that are painful or inflamed, including wounds. Though it may initially seem helpful for the cat to rid the site of dirt and blood, excessive licking can lead to infection and delay wound healing.
Cats' sense of smell is fourteen times more powerful than that of humans. Most predators, including cats, track prey through scent. A mother cat in the wild will try to hide her young kittens by removing evidence of their feeding. She will wash herself and them thoroughly after nursing. For the same reason, cats will bury uneaten dead prey in the wild. You may observe that same instinctual behavior when you see a cat scratching at the floor around the food dish after eating.
When cats groom, their barb-like tongues stimulate the sebaceous glands at the base of their hairs and spread the resultant sebum throughout the hairs. Their self-grooming also helps rid the coat of dirt and parasites such as fleas. Further, since cats do not have sweat glands, their saliva somewhat helps them cool down on hot days.
Grooming feels good, and cats do seem to groom just because they enjoy it. They will also groom one another (and their human friends) out of what certainly appears to be a desire to share a positive sensation.
Grooming to excess can become an obsessive-compulsive behavior which can lead to bald patches and skin sores.
Cats' over-grooming is often caused by stress and may be likened to humans' habit of biting their nails to the quick. Cats, in general, intensely dislike change of any kind. A new baby, a death in the family, even the rearranging of furniture, could be the trigger for this obsessive grooming. Physical causes might include flea bites, ringworm, or itchiness from allergies, so it is necessary to rule medical issues out before diagnosing a stress response.
Cats who were taken away from their mothers at a very early age were not allowed the normal weaning period, and will often self-groom by licking or sucking. This behavior will usually lessen and disappear over time when the kitten is kept in a safe and predictable environment.
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