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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.
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Some medical conditions can cause dogs to become aggressive.

If a dog that has never shown any sign of aggression suddenly begins growling, snapping, or biting, it may be caused by a disease or illness.

Brain diseases or tumors, thyroid disease, and rabies are a few illnesses that may provoke the onset of aggression.

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