Semi graphic bite photos.

[redshepherd]

You could get a nip from a large dog while playing, accidental. Attacking is aggression. I'm not sure I consider defensive bites( still more prevalent with small dogs) aggression. You can corner and terrorize anything into biting.

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There's actually a real term for it in dogs, called fear aggression or fear biting. It is considered a form of aggression, just a different source. Any "fight" response is considered aggression.