In veterinary medicine there is saying “killed by love”, and it usually applies to obesity. It also applies to pets with behavioral problems, because their humans are incapable providing the discipline needed to correct a problem. Anxiety and aggression are progressive problems, and usually stem from human interaction with their pets. I’ve heard endless stories from clients who lament the destruction of their homes, yet continue to engage in the same human behaviors which reinforce the pattern. The clichéd Chihuahua which attacks everyone but their human, a human who sees this objectionable behavior as a sign of devotion. At some point, the behavior crosses a threshold and the pet is now on the road to euthanasia. Every single veterinarian sees it, tries to stop it, and usually fails.