Dog is eating poop (Dirty and or decaying teeth)

There is evidence a possible cause of coprophagia (medical expression for your dog eating poop) is the lack or reduced intake of vitamin B. Vitamin B acts as a co-enzyme promoting several biochemical reactions to change carbohydrates into glucose which provides energy to the body. 

If the following conditions are true, it points very much to your dog having a vitamin B shortage: 

a) Excessive shedding

b) Constantly picks up fleas and ticks

c) Dirty and or decaying teeth

d) Motion sickness

e) Weight gain and constipation

f) Dog is on a vegetarian diet

g) Dog is getting antibiotics

(However if none of them apply your dog may still have a vitamin B shortage, albeit not that extreme). 

Commercial dog food contains vitamin B, unfortunately it is fragile and it's being affected by heat, light and air. So if the dog's food is left in its bowl for a long time, the B-complex vitamins will be destroyed. It is important the B-complex vitamins to be added as a supplement both to home made and commercial and diets.

Vitamin B  is available naturally in milk, eggs, brewers yeast, wheat bran, liver, wheat germ, kelp, kidney and heart, molasses; however even diets containing these, in many cases fall short of providing dog with enough Vitamin B. Being a water soluble vitamin, it should be fed twice a day.

Pet supplements can be found easily in the market: 

1. Supplements for the older dog

2. Vitamin B12

3. Vitamins and Supplements

Your dog might be eating poop because of a rare illness called "coprophagia". 

There are some medical conditions that may cause coprophagia, such as Exocrine pancreatic insufficiency, Pancreatitis, Intestinal infections, and more. Get your dog checked out, just to be sure there is not a health problem that causes this unpleasant habit.

When a dog is fed low-quality or inappropriate dog food, it feels like it should eat more in order to satisfy its body's craving for nutrients.
 
Dog foods must contain some specific levels of fat, minerals, vitamins and proteins depending on the lifestage of the dog. There are many complete and balanced dog foods in the market:

1. Taste of the wild 

2. Rocco & Roxie Liver Treats

3. Diamond Naturals

A yard or kennel where stools pile up might prompt a dog to 'clean up' his poops. Be sure to clean this area every day, and preferably just after the dog eliminates.

There are some products to apply to the poops to discourage your dog from consuming them. You can find them in pet supply stores or from veterinarians. 

1. Forbid

2. Dis-Taste

3. NaturVet 

Some products are especially made to tackle this problem, e.g. check out this one.

Find the stool and pour hot sauce over it, e.g. Habanero sauce. This makes the poop uncomfortable to eat but won't cause any real damage. After a bite or maybe several, your dog will come to the conclusion that it's not worth it.