My Coton wanted to eat poop when he was young. We started by taking him out while he was on a leash. As soon as he pooped, we picked it up and disposed of it. If he tried to eat other dogs poop while on a walk, we used a firm "leave it" command. In both cases, he was rewarded with a high value treat.
You may want to try a different food, your vet may have some suggestions.
I was wondering if any Coton parents have experienced IVDD. Our 5 year old female had emergency surgery for a herniated disc in April and was completely