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I am sorry you are worried about your cat's hair loss. If you look closely, is the hair on the legs and belly thin, with short broken hairs, or does he have totally smooth, hairless, bald areas?
If he is losing hair, he would be smooth and bald. If he is grooming excessively (which usually occurs when you are not watching him) he would have short broken hair. Most of the time cats are losing hair in these areas, it is because they are grooming excessively. This can be caused by an allergic reaction to fleas (and don't discount fleas if you don't see any; the reaction can be to one or two fleas which the cat swallows while grooming), to food, or to other things in the environment.
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