https://apnews.com/949b5e3546c0458891939c836747d495 > Bad dogs tend to die young. That's according to a British study that says aggression, excessive barking and disobedience are among behaviors that can doom canine pets to an early demise. > One in three deaths among U.K. dogs younger than 3 years old was from "undesirable" behaviors. Euthanasia was the most common cause of those deaths — 75 percent overall. Traffic accidents involving disobedient dogs were another common cause.