Dominance
Dominance is the most common reason why dogs are aggressive toward other dogs. While it's true that as pack animals, dogs are sociable, packs have hierarchies. And usually, an alpha establishes his dominance within a pack through either threat or physical harm.
Can dogs live together after fighting? The answer is, most of the time, YES. There are times when dogs may be like an incompatible couple and need to divorce, but in general, there are things you can do to help combative pups get along.
There is no real cure for inter-dog aggression. Instead, treatment is heavily focused on controlling the problem. Owners must learn how to avoid situations that encourage aggressive behavior in the dog, and to break up fights quickly and safely when they occur.
Don't Let the Dogs “Work It Out”
Years ago, people used to believe in letting dogs fight to work it out between them. This is dangerous for both dogs and for nearby people. Also, the dogs may never get along after such a fight.
The separation often reduces stress for both dogs, especially when one or both dogs are showing active avoidance of each other. Keeping the dogs separated also reduces stress for the people living in the home. They don't have to constantly wonder if a fight is going to start this time.
Punishment should be avoided. The dog-dog relationship will not be improved if you scold, punish or hold down a dog as punishment; in fact you may make it worse by punishing the dog for signaling and communicating their aggressive intentions.
Increased exercise and regular obedience training may also be effective in reducing aggressively dominant dogs, and some forms of training may be used as distractions, focusing the dog's attention off of negative stimuli in a training technique known as a counter-conditioning treatment.
For dogs exhibiting territorial aggression, you will need to gain enough control to have your dog sit, stay, and when calmed down, take a reward at the front door. Generally, a leash and head collar will give the fastest and most effective control (see Training Products – Head Halter Training).
Some have recommended that the dogs not be anywhere near one another for at least 48 hours following the fight, even if they live in the same household, while others recommend that getting a positive interaction between the two animals as soon as possible is the best course of action -- at the end of the day, however, ...
Most scientific studies indicate that it is very possible to rehabilitate a dog after they bite another dog or person.
Dog aggression can be related to fear, prey drive, socialization issues, and guarding territory, among other things. Most aggressive behavior in dogs stems from fear and anxiety, rather than the desire to hurt others. A certified animal behaviorist can help you safely deal with your dog's aggressive behavior.
In a real fight, the dogs will target the stomach, throat, and front legs and the victim of the attack will often retaliate by grabbing a hold of the other dog's neck. If your dog is involved in such a fight and receives severe injuries, take him to the vet immediately.
If your dog is showing any changes in their behaviour, especially if they have started showing aggression suddenly, you should contact your vet as soon as possible. Aggression tends to get worse over time and can lead to serious injuries to you, your dog or other people and pets so getting help is essential.
So How Do We Fix Dog Aggression? Aggression is an incredibly complex topic, and every single case is different. Some aggression cases are entirely fixable, while others will always require a level of management.
Even dogs that live together or are related can and will fight. Unfortunately, some fighting dogs will not stop fighting until an injury occurs that results in one dog backing off. However, some triggers are easily identified and can be avoided.
Break the fight up quickly and calmly, redirect the dog's attention, take them for a walk together, and don't worry that it's going to happen again. They may or may not fight again, but if worry over it does not become your obsession, you will not be feeding them negative energy that will lead to another fight.
Certain breeds seem more prone to suffer from rage syndrome, including Cocker and Springer Spaniels (hence the once-common terms – Spaniel rage, Cocker rage, and Springer rage), Bernese Mountain Dogs, St. Bernards, Doberman Pinschers, German Shepherds, and Lhasa Apsos.