Name a behavioral issue that may require immediate attention from a handler.

Aggression towards other dogs or people is a behavioral issue that requires immediate attention from a handler because it poses a significant risk to the safety of the dog, the handler, and others in the environment. Aggressive behavior can lead to dangerous situations, including fights between dogs or potential injuries to people, especially if not addressed promptly.

It is crucial for handlers to intervene early to manage and modify this aggression through proper training and behavior modification techniques. This not only helps in safeguarding others but also in improving the overall well-being of the dog, ensuring that it can engage positively with its surroundings and other social beings.

In contrast, while disinterest in toys, excessive barking, and inability to perform tricks can indicate underlying issues that may need addressing, they do not typically present the same level of immediate danger or urgency as aggression does. These other behaviors can often be modified with patience and consistent training without posing a significant threat to safety.