This "diagnosis" is not always very well received by a pet parent. Three common categories of aggressive behavior are fear-induced, possessive or food-related, and territory-based.

KNOXVILLE, Tenn. (WATE) — Many of us have that furry friend at home who is often considered part of the family, but in May alone, two infants died in East Tennessee, and one toddler was hospitalized ...

It sounds like overall, the transition from a one-dog to a two-dog household has gone smoothly, albeit there are occasional aggression issues directed from the older dog toward the younger dog.