Even the calmest of dogs has the propensity of being really aggressive and unruly if it (or its nose) is rubbed the wrong way. Owners and handlers should ensure these steps are taken to develop emotionally stable dog behavior.
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Prevention is always better than cure, and an obvious step to take in handling an aggressive dog is to watch for signs of hostility. If your dog is emitting low growls, tensing up or not wagging its tail, it is sending up a red flag and its behavior needs dealing with. In addition, its ears may flatten and its hairs may stand. Further, it may tilt its head in the direction of the source of the aggression. Recognizing the warning signs it displays is a first step in controlling canine aggression.
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Safety always comes first when controlling an aggressive canine. If you own a dog with a propensity for aggression, make sure that it is taken out only when it has a muzzle on. If you wish to give your dog a little freedom from the muzzle, ensure that it is not reacting aggressively to its surroundings. When it shows that it can react properly to stimuli, the muzzle can be removed accordingly.