When you find you beloved dog dead and are not able to find out the exact reason behind it, you become anxious. If you feel that somebody has poisoned your dog, you need facts about it. It may be either your mere suspicion or a valid reason to think in this way. If you find some justification and think of a person who would have done it, you may complain against him to the concerned authority. If you have some other pets also, you should take care of them to avoid this kind of incidence again. But this feeling may be because of a kind of social paranoia as well where you become more suspicious.