What can cause aggression in animals besides behavioral issues?

Medical problems can significantly contribute to aggressive behavior in animals. When an animal is experiencing pain or discomfort due to an underlying health issue, it may react aggressively as a defensive mechanism. Common medical problems that can lead to aggression include infections, injuries, neurological disorders, and hormonal imbalances. For example, a dog suffering from dental pain might snap at a person who tries to examine its mouth out of fear or discomfort. Likewise, conditions that affect an animal's mood or perception, such as hyperthyroidism in cats, can also lead to unexpected aggression.

Understanding the medical factors that can influence behavior is crucial for caregivers and veterinarians, as addressing these health issues can often alleviate the aggression and improve the animal's quality of life. This underscores the importance of a thorough veterinary evaluation when an animal exhibits sudden or unexplained aggressive behavior, distinguishing it from aggression that may stem from behavioral issues or other factors.