Some supplements which have been suggested include pumpkin seeds, breath mints, papaya, anise seed, and pineapple. If you're aware of a compound which worked, please email Erik and he will hopefully add a comprehensive list and discussion of rare or exotic remedies. If the dog engages in this behavior when unattended, or consumes the feces directly when it comes out, a muzzle may be a practical solution to the problem. If it is well tolerated and the dog does not have to have it on for extended periods of time, this may be one of the more practical ways to deal with a dog who is coprophagic and unsupervisable. Anecdotally, this seems to be a behavior most often occurring in younger dogs.
Many owners report that their dog eventually grows out of it.
While not exactly treatment, it is possible that the dog will stop being coprophagic as it ages. When the dog is about to begin eating feces, the owner can use any variety of commands. The idea here is to distract the dog long enough to allow the owner to pick the feces up and make the dog forget about the coprophagia behavior. Because the mechanism and reasons why dogs engage in this behavior are unknown, it is not known which behavior modification therapies will be most effective. It is the opinion of this author that a combination of reinforcing desired behaviors and picking up feces is the best combination for treatment of coprophagia.