Licking wounds speeds healing

jkoch

By Dr. John Koch

Question: I have always been told that animals heal themselves by licking their wounds. Is this true or just another old wives' tale?

Answer: Scientists have indeed isolated a component in saliva, which promotes healing. It is called "epidermal growth factor." This substance promotes the formation of both new skin and new capillaries. Apparently, the compound works by either prompting cell division or by attracting cells from other parts of the animal's body.

Licking also helps by cleaning the wound and its massaging effect increases circulation to the damaged tissues. All of these factors combine to speed the healing process.

It should also be noted that excessive licking might be traumatic and as such delay or even prevent healing. Nodules that are raw and ulcerated frequently result. These nodules are usually located on the lower legs or paws and are called "lick granulomas." Such granulomas are very difficult to treat because pets will not stop licking them long enough to allow healing.

As with many things in life, licking in moderation is good, but in excess, it is harmful.

Dr. Koch is a Cape Girardeau area veterinarian.