I am certainly not an expert, but from personal experience, a dog licking their wounds in a way to stimulate healing. This licking can also help humans. My father-in-law swears that dog licking is healing, in his words. Any time he has a minor cut or abrasion he lets his dog lick it, and sure enough, it heals quickly. I've tried it a couple of times myself. I know nothing of the chemical make up of dog's saliva or even if it does speed healing. Just thought I'd share the anecdote and wait for an informed perspective from our emergency vet friend.