Zasto psi ujedaju:
a) Resource related aggression:
1) Dominance - Bark, growl, bite directed to family members or other dogs; often very friendly to strangers. Occurs in response to challenges to social status. The dog assumes dominant postures (e.g. paw over owner’s shoulder) and resists submissive postures (e.g. pet,
groom).
2) Possessive/ competitive behaviour - Bark, growl, bite directed to humans or animals, if the dog is approached when it is in possession of food, toys or objects. Often associated with dominance aggression.
3) Protective/ Territorial behaviour - The dog barks, growls or bites when a person or animal approaches: an area protected by the dog (home, room or yard), owners, or other animals.
b) Aggression resulting from biological causes
1) Pain-induced aggression - Growl, bite directed to humans when a person tries to groom, medicate or manipulate a painful area. Or before manipulation of something the dog has learned is painful.
2) Maternal behaviour - Bark, growl, bite directed to humans or animals, if the individual approaches puppies, puppy surrogates, nesting area. Depends on hormonal state, passes with change in hormones.
c) Fear - Bark, growl, bite directed to humans or animals, when the dog is approached or reached for (especially if cornered), or when
threatened or punished. The dog displays facial and body postures indicative of fear (e.g. ears back, trembling).
d) Redirected aggression - Growl or bite redirected to a person or an object that did not evoke the initial aggression. Occurs when there is interference while the dog is threatened or fighting.
e) Predatory behaviour - Chases or bites humans or animals. The behaviour is stimulatedby quickly moving stimuli and often preceded by stalking. It does not involve growling or snarling as a preliminary warning.
Table 3: causes of aggressive behaviour (Borchelt and Voith, 1982; Overall, 1997,
Hart and Hart, 1985; Case, 1999; Askew, 1996; Sparagetti and Verga, 1991; Sherman
et al., 1996; Jones-Baade & McBride, 1999).
http://www.era.lib.ed.ac.uk/bitstream/1842/2668/2/Nelly Lakestani Thesis.pdf
strana 40.