Our expert says:
Cats often do this as a result of hairballs in their stomachs, due to grooming themselves. If you see him hacking, you can give him a quarter teaspoon of Vaseline or butter. You could just put it on his paw to get him to lick it off. You get hairball lubricants from the vet and you also get hairball diet cat pellets, which work really well. A higher fibre diet sometimes helps, so rather than giving your cat tuna, try adding grated carrot or apple or giving a tinned cat food that is higher in fibre than pure tuna. Regular brushing of your cat is another good way to help prevent hairball buildup.
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