Vitamin E is a great option, and you can use the capsules, poke with a pin. It also comes in a small bottle, liquid form, but it's pricey. Don't be surprised if he licks even more, it smells like fish! Or burts bee's wax stick works wonders too - more lick proof than other so called chapped sticks. I'd get the scent free one and put it on your finger then on the lips. Trying it directly may become a chew toy! LOL