Interdog aggression (more commonly known as "dog aggression") is distinct from "handler aggression" in that the dog is aggressive toward other dogs, and this behavior may be completely devoid of handler aggression.

In all cases of interdog aggression, there will be physical signs-- although sometimes subtle-- of the aggression, before the dog acts.  This may include:

- Stiff and rigid body language.
- Pulling the mouth closed tightly.
- The dog may lock his gaze with the other dog.
- Curling of the upper lip.
- Lowering the head (in a stalking/hunting-like position)
- Dominant body language or seeking to be physically in a higher position than the other dog.
- Hackles up
- Lips curled tightly against the teeth, and showing of the teeth.

Interdog aggression can be broken down into the same main subcategories that every other type of dog aggression can be categorized in, namely:

- Dominant aggression
- Fear aggression or defensive aggression
- Territorial aggression
- Protective aggression (usually of puppies)
- Pain response aggression

Of course, there are others, but most will fit within one of the above mentioned categories.

The following includes a brief list of articles on interdog aggression that you may find interesting:

Interdog aggression: What are the warning signs?

Interdog aggression can strike with deadly consequences

Interdog Aggression: When to Intervene?

A Behavioral View on Dog Aggression

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