Signs of stress or fatigue will cause a dog to lick excessively.
Some believe that behavior training corrects the problem, but punishment is not the answer. Rewarding the dog for not licking may take some time, but some dogs respond to this type of training to correct the licking problem. Some breeders believe in treats for curing excessive licking behavior.
Another simple technique you can use to stop your dog's excessive licking is to divert his attention. When he starts to lick his paws, your face, the floor or anything at all, catch his attention and throw a ball for him to fetch.
Regular exercise can make your dog healthy. Exercise can also stimulate the dog's brain, release a lot of pent-up energy, and keep the dog happy. This will help stop the dog from licking out of boredom or frustration.
There is an article I found that can help with licking issues.
Disobedient Dog Help