1 Your suddenly aggressive dog may have an injury or an illness that's causing major discomfort and stress. Some possible causes of pain include arthritis, bone fractures, internal injuries, various tumors, and lacerations. Other illnesses may affect your dog's brain, leading to seemingly unreasonable aggression. 15 февр. 2020 г.
More useful articles on a similar topic 👇
What illness causes dogs to become aggressive?How do I stop my dogs aggression suddenly?