The B. Sc. Thesis discusses the reasons for aggressive behaviour in dogs. It defines aggression, the types of aggression, the reasons for aggression, and the effects on the aggressive behaviour in dogs. Experts have identified different categories of dog aggression. For the purpose of this B. Sc. Thesis, aggression is divided into two types: affective and non-affective. Affective aggression can be further divided into: pain-induced aggression, dominance aggression, intra-sexual aggression, fear aggression, possessive aggression (including maternity), taught and redirected aggression. In case of non-affective/hidden aggression, a dog reacts quickly without any preceding signs (predatory instinct, playful aggression, sickness-induced and sexual aggression). Factors that affect the dog's aggression are the dog’s personality, breed and genetic predisposition, its age and gender, health condition, the owner and the character of the owner, and the environment in which the dog lives. Dog aggressiveness is of great importance to humans. In the past, it was desirable for the various tasks that people assigned to dogs, and for this purpose they have also bred different dog breeds. In recent times, the role of a dog in a person’s life has changed, as most people own dogs solely for socializing, regardless of the breed. The emphasis is on recognizing and understanding aggressive behaviour in dogs, which is crucial for owners to control and manage it.
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