When dogs lived freely, aggression was an important characteristic. Dogs needed to have an aggressive attitude to protect themselves, their territory, their food, and their families. That is why to this day, some dogs still display those innate characteristics. In today's world, however, excessive aggression, like biting, snarling, growling, and showing of the teeth, can be dangerous to other dogs, people, and even the aggressor himself. There are many reasons dogs can be aggressive. How the puppy grew up is one of the determining factors. A dog that's been abused is more likely to run his temper on others, as well as a pup that was raised by their owners to play rough, could also land his teeth on an innocent arm. Most importantly, socialization of other pets and people play an important role in how a dog will act toward others. If a dog has a lot of fear, or untrustworthiness of strangers or new situations, then they are more prone to act out. What to remember is though, all of the aggressive habits can be fixed. Some problems take longer then others to fix, but ultimately a dog wants to be happy, relaxed and friendly, and will choose to do so once he feels safe. Game Plan... Remind him who's boss. Sometimes in order to start working on aggressive behavioral training, it's good to review basic training to whip that pup into shape again. An obedient dog to his master is much more willing to learn, and therefore more able to trust your disciplinary actions. After that, the next time your dog growls, spits, or bites, give him a firm "No!" You want the pup to stop what he's doing and show submission. This way he'll think twice before doing it again. The trick is to be firm, but not terrifying. You don't want to scare the daylight out of him. But if you think your voice just isn't doing the trick, try to... Shake him up. Dogs don't like loud noises, so the next time you pup gets aggressive, take him down a notch by rattling a "shake can". You can make your own by getting an empty, clean can (soda can or soup can), and fill it with pennies or small pebbles. Then take the top securely so nothing can fly out. When you dog acts out, firmly say "No!", while shaking the can in his face. The load noise will then be associated with the "No!" and remind him that he is getting out of line. Stop him in the act. This may seem obvious, but it is extremely important to discipline a dog's behavior right when he's doing it, or directly after. This will lead to better reinforcement. Many times dogs will try and be sneaky or act badly when you not looking (yes- they are that smart!), so it's imperative that you keep a close eye on you pooch when he is liable to do an aggressive act. Try a time out. Dogs don't like to be alone. One of the best ways to show them that you don't like their aggressive behavior is to separate him from what he loves best - you. Shut him in another room alone for five minutes, and then let him out. Repeat as needed, but you must do it immediately after the action and only for five minutes so they can associate the discipline with the behavior. Socialize. Dogs can be very territorial of their house and family. It's important that when their young, they get exposed to strangers and other dogs. Dog parks are great for that, as well as having people and pets over to your house. To get your dog to not fear strangers, try keeping a stash of treats in you pocket when you're out, or by your front door. Let the strangers offer your dog the treat in a nice soft friendly voice. Sign up for classes. If you don't think you curb your pups problem on your own, there are many classes available to you and your doggie. From puppy classes, to obedience classes, to problem behavior classes, there's unlimited options you can do to get your dog back to it's best behavior. Puppy classes is perhaps the best way to prevent your dog from aggressive behavior latter because it provides exposure to other dogs and people, as well as teachers owners to gain control of their dogs. Most dogs can start classes between 12 and 16 weeks of age.

Please be aware that every dog is different and some methods of discipline work better for some the others, and there may be variations in the length of training needed. The most important thing a dog owner can do is be consistent. Aggressive problems in dogs are one of the harder behavioral issues to fix, but can be done with persistence. If your pet is posing a serious threat, don't try to handle it alone. Call your vet or an animal trainer for advice.

(Reference: www.4pawparadise.com - designer dog beds, AND "The Doctor's Book of Remedies for Dogs and cats" by Prevention for Pets, Inc)