First and foremost it has to be said that the most aggressive are female dogs to each other. Male dogs can be aggressive, especially if you have two dogs of different ages in your household.
Sometimes the younger dog that probably came as a puppy to you all of a sudden starts with 2 to 4 years to challenge the older dog for the lead role. In many cases the older dog might give up his alpha status, but not in all. It depends very much on the age of the dog. The owner making mistakes though triggers many times the aggressive behavior.
Let’s try to explain first the hierarchy of dominance between animals. There are “alpha dogs” and “submissive dogs”. Keep in mind, you as the owner are even ABOVE the alpha dog in the hierarchy! (more…)