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Fleas
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Cats may pull out their hair if they have fleas. With fleas, the hair loss is usually at the base of the tail. Antihistamines can relieve the itching, and then you should start your cat on flea preventatives.
Mites
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Mites are responsible for mange. Cats will lick and chew themselves to get rid of the itching. Your vet can prescribe a topical solution to get rid of the mites.
Ringworm
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Ringworm is a fungus that causes hair loss around the face and feet. Oral and topical medications can treat this. Be warned that ringworm spreads to humans, and children are particularly susceptible.
Allergies
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Your cat may be allergic to his food. In this case the itchiness, redness and hair loss is around the head and face.
Stress
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Cats can get stressed and anxious. If your cat has had a major change in his environment, that may lead to excessive licking and grooming. Your vet can prescribe anti-anxiety medications if you suspect he is chronically stressed.
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Why Is My Cat Losing Hair in a Patch?
A cat's pride and joy is his coat. It is not normal for patches of hair to be missing as a result of the cat chewing, scratching or licking it off or by its just falling out. Once you properly diagnose why your cat is losing hair, you will be able to treat him.