There has been a lot of research on aggression in dogs in the past. However, the potential use of thermography to identify the predisposition of an individual dog to express a particular form of aggression has not been extensively investigated. The aim of this thesis is to objectively determine the parameters of aggressive behaviour and the physiological profile of an aggressive dog based on infrared tremography, which we hypothesize to be an effective non-invasive method for investigating stress signs in dogs. Two groups of dogs participated in the study, 15 dogs with no history of aggressive behaviour and 16 working police dogs that show aggression in their work. A socially acceptable behaviour test, designed to elicit aggressive behaviour from the dog, was conducted on an outdoor polygon and consisted of 16 individual tasks. The dogs' body surface temperature was measured before and after the test. Facial surface temperature was measured frontally, also before and after the test and after each individual task. When measuring body temperature and facial temperature before and after the test, we found no statistically significant differences between aggressive and non-aggressive dogs. However, when measuring facial surface temperature during the test, we found higher temperatures in aggressive dogs, contrary to our hypothesis, and statistically significant effects for coat length, humidity and wind speed. In our study, we found that temperature measurement during the test is a better indicator of emotional state than before and after the test and that the cardiovascular system is activated during the expression of aggressive behaviour.
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