1Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
2Centre for Veterinary Epidemiological Research, Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Prince Edward Island, Canada
Prevalence of different aggression types and some related risk indicators were studied in 434 dogs presented to the School of Veterinary Medicine at Shiraz University over a one-year period (From March 2010 to June 2011). After taking case histories and examining all dogs, related questionnaires were completed for each dog and the nine classical types of aggression were evaluated. 25.3% of all cases had bitten at least one person or animal during their life. The most frequent aggression type was conflict (dominance) aggression (36.6%) followed by fear (20.9%) and protectiveness (20.9%) aggression, intraspecific (7.8%), medical (3.9%), redirected (2.6%), pain (2.6%), maternal (2.6%) and predation aggression (1.9%). Sex, age and indoor/outdoor keeping had a significant effect on conflict aggression. Males (P<0.001), more than 2 years of age (P=0.001) and outdoor dogs (P=0.02) revealed significantly higher levels of conflict aggression. The majority of the cases did not understand obedience orders of the owners and needed more training to obey properly. Raising the level of socialization of the pet and owner’s knowledge about training principles may reduce these behavioral problems in Iran.