Functionally, these neurons are either motor (conducting impulses that will cause activity such as the contraction of muscles) or association (conducting impulses and permitting 'communication' between neurons within the central nervous system).
The scant research that has been done on the causes of pica suggests that the disorder is a specific appetite caused by mineral deficiency in many cases, such as iron deficiency, which sometimes is a result of celiac disease or hookworm infection.
In fact, fewer than 10% of dogs seem to be sick before eating grass, according to their owners. And grass-eating doesnât usually lead to throwing up -- less than 25% of dogs that eat grass vomit regularly after grazing.ica is the technical term for the disorder characterized by eating things that arenât food. Sometimes pica indicates that your dog has some type of nutritional deficiency, though it is often simply a sign of boredom, especially when practiced by puppies and younger dogs.