It seems that my friends dog has done just that. This dog that he has had been tied up in the back yard for years and after the majority of the family that showed it affection left he was depressed. Since the only family members that showed him affection left he was very sad and three weeks later it hung itself on its own chain over a fence. Was is fascinating is that the dog has jumped over the fence many other times without haning itself and lived. When it was found this time dead it seemed as if it on purposely pulled itself hard on it's neck and either choked to death or it broke its own neck. Can animals commit suicide? Was this dog just really stupid or was it really hurt inside. What do you guys think?