Coprophagia
Coprophagia is the ingestion by a dog of feces, either its own or those of another dog or animal. It can be caused by medical conditions such as exocrine pancreatic insufficiency, overfeeding, or malabsorption. It can also be a behavioral problem characterized by attention-seeking, reinforcement, or as a learned behavior. Numerous health problems can arise from this activity, including internal parasites or infection with canine parvovirus or toxoplasmosis. Treatment includes behavioral modification therapy or altering the feces to affect its taste.

Pica
Pica is an appetite for, or the behavior of eating, non-nutritive substances (e.g., sand, coal, soil, chalk, paper etc.). Pica can be dangerous to dogs, with a risk from eating dirt near roads that existed prior to the phaseout of tetra-ethyl lead in gasoline or prior to the cessation of the use of contaminated oil (either used, or containing toxic PCBs) to settle dust. In addition to poisoning, there is a risk of gastro-intestinal obstruction or tearing in the stomach or blockage of the esophagus.