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Consider the role of serotonin. Low serotonin levels are linked not only to human depression but also to canine impulsivity and aggression. A dog that attacks "out of nowhere" may not be a "bad dog"; it may have a serotonin transport deficit. Similarly, elevated cortisol (the stress hormone) from chronic anxiety can suppress the immune system, making a fearful cat more susceptible to upper respiratory infections.

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: Hiding food inside boxes to stimulate his natural hunting instincts, shifting his focus from his physical trauma to a mental goal. Positive Reinforcement Consider the role of serotonin

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"She’s stuck in an unfinished loop," Aris explained, his voice low. "In her mind, she’s still on the clock, but the 'find' never happened. Without the resolution of the task, her cortisol levels are spiked in a permanent state of high-alert. Her body has shut down digestion to prioritize a hunt that isn't happening."