I took my cat to the vet and he got his claws trimmed. The vet said my cat had fleas. I started giving my cat Brewers’ Yeast and Garlic vitamin pills every day. I also put my cat on a diet since he is overweight. But since he came back from the vet, and started taking vitamins and dieting, he has been licking his coat excessively and chewing on the top of his paws. Why is he doing that and what can I do to help?