Frustration-induced aggression is generally triggered by pain, deprivations (hunger or thirst), frustrations (reward turning into punishment) or persistency of physical contacts when the appeasement signals have been emitted. This is illustrated by bites when you try to cuddle your dog. This type of aggression is systematically present in dominant dogs.
Sex hormones strengthen this type of aggression, especially at the beginning of puberty. Early neutering can decrease the frequency of aggressions, but generally the owner is concerned too late about it.
If this type of aggression appears suddenly (in a perfectly integrated dog), it can be triggered by an organic infection or by attacks to the sensory organs, such as otitis, arthrosis, deafness or blindness, or simply by a disorder in the perception of light (Puddle, Briard, Collie, Pyrenean Shepherd Dog).
Frustration induced aggression quickly becomes a habit, and the dog no longer manifests a threat phase; he bites immediately.
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