Which condition reflects the progression of behavioral issues from chronic stress?

The progression of behavioral issues from chronic stress is best reflected in behavior disorders. When animals experience chronic stress, it can lead to changes in how they behave. This might manifest as anxiety, aggression, or other unwanted behaviors that disrupt their normal functioning. The close relationship between chronic stress and behavior disorders underscores the impact that ongoing stress can have on an animal's mental health.

Behavior disorders often stem from the inability of an animal to cope with prolonged stressful experiences. As stress accumulates over time, it can result in maladaptive coping mechanisms, leading to observable changes in behavior. These disorders can represent a learned response to the environment, cementing the connection between ongoing stress and the development of behavioral challenges.

While physiologic changes can occur due to chronic stress, and conditions like inflammatory bowel disease can be influenced by stress, the most direct and clear outcome in the context of this question is the emergence of behavior disorders. These represent the culmination of the animal's struggle with chronic stress, illustrating the mental and emotional toll that persistent stress can take.