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vassilis:
@catdad there is nothing I can really do. He is just old. :(
catdad:
10 isn't that old for a cat. Average life expectancy is about 15 years. If you haven't had him checked by a vet, do. Hair loss like that is more likely to be allergic reaction to flea bites or other parasites or possibly over-grooming due to stress/compulsive behavior.