SOMETIMES this is, indeed, a "stress reliever", but far more often, foot lickingis an indication of allergies. If your dog also sufferes chronic ear irritation or itching, odds are, he/she has allergies.
Allergies are extemely difficult to treat as testing to pinpoint specific ones is expensive. It would likely be easiest to start with the assumption that your dog has a food allergy. Chicken, Beef and grain glutens are the most common.
Try eliminating these, one at a time, from your dog's diet. Be patient, it may take weeks/months for you to notice any difference, but be vigilant. No treats etc. containing whichever product you are eliminating from the diet.
If the problem IS stress related, try to offer your dog a variety of chew toys. Many dogs chew as a "stress reliver" but may become bored with the same old chew toy.
Hope this is helpful.
Answered by Anonymous - 2/3/2013 9:12:27 AM