Dog aggression can manifest itself in many ways, such as through growling, snapping, nipping, biting or lunging. A sudden onset of aggression is often caused by a medical condition, although behavioral problems can also play a part.
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Significance
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Sudden behavior changes, such as aggression, fear or aloofness, can be scary, but they are often your dog's way of dealing with something that doesn't feel right in his body. To treat the behavior, you must discern the cause.
Pain
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If your dog has an injury or has recently developed joint or muscle pain, he may react with sudden aggression if you attempt to touch the painful area. Make your dog as comfortable as possible and avoid touching tender areas while you consult your veterinarian.
Illness
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According to PetPlace.com, hypothyroidism--when the thyroid produces insufficient hormones--and hypoglycemia--or low blood sugar--are common causes of sudden aggression. Illnesses such as distemper and rabies can also result in sudden aggression. Seizures, as with epilepsy, can have the appearance of aggression, when in fact your dog is merely seizing and not lashing out.
Trauma
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Head trauma or brain tumors can cause sudden behavioral changes. Emotional trauma can have the same effect. Dogs at home alone can be traumatized and exhibit aggression from an event that happens without your knowledge, such as a thunderstorm or robbery.
Treatment
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Visit your veterinarian for a complete health check, including a blood panel, fecal screening, urinalysis and potentially X-rays or CAT scans. If your dog has a clean bill of health, consult a trainer who can help you determine the cause and reduce your dog's fears.
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