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by Katherine A. Houpt. This classic text is an essential reference for understanding normal behavior in domestic animals, covering everything from communication and social structure to newer fields like the microbiome and animal cognition. Price : ~$124.75 at Barnes & Noble .

Changes in behavior are often the first "symptoms" of physical pain. A cat that stops jumping might have arthritis; a dog that becomes suddenly aggressive might be experiencing neurological discomfort or dental pain. by Katherine A

The veterinary behaviorist uses drugs not to "sedate" the animal, but to lower the animal's stress threshold so low enough that learning can actually occur. Price : ~$124

For pet owners, the line between a behavioral problem and a medical problem can be blurry. Here is a general rule of thumb: The veterinary behaviorist uses drugs not to "sedate"

: Understanding how physiological states and neurological conditions influence behavior. For example, thyroid disorders can affect mood and energy levels in dogs, while neurological conditions can lead to a variety of behavioral changes.