Excessive licking and grooming

Your kitty´s excessive licking and grooming can have several causes: stress, food allergies, and more. Your first step is a visit with your vet to determine whether it´s a health or behavior problem.
Many cats are allergic to corn, a main ingedient in most dried cat foods. If your vet suspects an allergy, change the cat´s food and watch for improvements in your cat´s coat and behavior. Your vet can suggest brands of food that will help the most.

If the licking is due to stress, try to remove the source, or simply manage the stress. This is particularly important in multiple cat-households. We have four, & the low man on the pecking order stopped chewing his fur when I started feeding him without the others present. I also give him ´special time´, i.e. an hour per day, when he is with me alone and gets undivided attention.