I have had a dog or two over the years that was a feces eater (coprophagia)
The only thing I found that worked, was to follow them around with a pooper scooper when you think they are due for a bowel movement, scoop and discard immediately, out of sight out of mind. After awhile they stop turning around to look for it. In my experience, it doesn’t matter what you feed them. Sometimes puppies will out grow this nasty habit as they mature. It is what it is. You cannot let these dogs alone with their feces.
Has the vet ruled out medical issues?
Excerpt from the article I provided via link below https://www.petplace.com/article/dogs/pet-behavior-training/coprophagia-eating-feces-behavior-in-dogs/
Coprophagia is not an abnormal behavior for canines in certain situations. Bitches naturally consume their own pup’s feces – presumably, to keep the nest clean. This behavior provides a survival benefit as it prevents unhygienic conditions from developing in the nest; a state of affairs that could lead to disease. The biological drive to eat feces, which is implanted as a survival instinct, compels nursing bitches to ingest their pups’ feces.
In addition, many puppies go through an oral stage in which they explore everything with their mouths, sometimes ingesting a variety of non-food items, including feces.
As time goes by, the majority of pups eventually learn that food tastes better than feces and they swear off the stool-eating habit for the rest of their lives. Some older puppies may continue to eat feces for a few months, but most grow out of the habit after the first year.
Barring nursing bitches, the majority of “normal” adult dogs have absolutely no interest in eating feces.
Slow learners, “oral retentives,” and pups in which habits are easily ingrained may continue to engage in coprophagia well beyond the accepted “norm” and may engage in it to excess. Such hard-core coprophagics continue the behavior long after their peers have developed new interests. Dogs like this, that seem addicted to the habit, may best be described as “compulsive.”
Below is a list of possible contributing factors though more than one may be operating in any one case.
The opportunity to observe the dam eating stool
High protein, low residue, puppy food
Irregular feeding schedule
Feeding inadequate amounts of food
Under-stimulating environment
Constant opportunity to ingest feces
Inadequate attention/supervision
