I got a shihtzuh at 12 weeks old. It didn't take long to know we were dealing with coprophagia. She is now 10 months old and we have not been able to break the habit. We tried many suggestions. Thought maybe you could help.
Try Forbid or deter. You can double the dose if you have to. Also try taining your pet to go the bathroom outside only. You can then clean up after her when she goes to the bathroom. Try placing a treat in her mouth after she defecates. vetcrae