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Territorial
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Territorial aggression occurs when dogs feel as though you are moving into their space or getting too close to something that is theirs. This includes their food bowl, favorite toy or even their place on a piece of furniture. Instinctively, this aggressive behavior demonstrates an assumption on your dog's part that it is your dominant superior within your household. It is reacting to your aggressive attempt to usurp its authority and claim territory for yourself. Remember that your dog has ways of communicating with you and uses these methods regularly. This includes growling, snarling, stance and even where it stands in relation to you.
Fear
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Aggression, resulting from fear, occurs when your dog feels as though it is being physically threatened. This can occur when your dog feels boxed in, unable to escape or restrained. It is sparked by your aggression, in the form of a raised voice, sharp gestures or an aggressive stance. Your dog is reacting to you, and this kind of aggression is instinctual. It is not a relation of its feelings toward you or its perception of you. It is a simple instinctual reaction to your actions. If you notice your dog showing fear-based aggression, reevaluate the way you punish your dog.
Pain
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Pain-based aggression is another natural response that your dog will exhibit when it is feeling ill or in physical pain. It is an instinctual response and a natural defense against predators. If your dog is ill or in pain, handle it with care and avoid becoming aggressive as a response. Your dog cannot help its reaction to pain; it is your responsibility to show your dog compassion and to handle it with the utmost concern for your safety and your dog's.
Redirected
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Redirected aggression occurs when your dog is simply having a terrible day. It may exhibit signs of isolation, trying to hide from you or sit on the other side of the room from you. Redirected aggression is not focused and you will notice similar aggression toward anyone who attempts to get close to your dog. Avoid forcing yourself on your dog when you notice these problems. Instead, coerce your dog into a room or backyard, away from others, where it can rest and get over its problems. After a time, return to the room and watch your dog's response. When it is excited to see you and demonstrates its normal personality, you can let it out.
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Types of Aggressive Dogs
Aggression in dogs is not limited to or defined by a breed. Common aggressive tendencies are possible with any breed of dog. While some breeds form stronger attachments to their owners and other breeds exhibit their own unique personalities, the causes of aggression are generally the same. Even if you treat your dog well, aggression remains a concern within your home. If the situation is too extreme, seek a dog training professional who can train away most aggressive tendencies.