If you have a dog that is eating poop - start feeding him a nutrient packed / balanced diet, give him plenty
of exercise / playtime / interaction, keep his living
areas / crates / kennels /
yard as clean as possible, avoid
locking him up and leaving him alone for a long period
of time, and take him to the vet on a regular basis for checkups so that you can catch any underlying medical issues early before they get out
of control.