No fence fighting 

Does your dog bark or growl at dogs (or people) as they walk by your fenced yard? Dogs that need exercise and mental stimulation can develop fence fighting issues that lead to aggressive, territorial behaviors. Stop these bad behaviors before they become patterns. 

• Supervise your dog when he's outside and stop him before he shows fence aggression. 
• Take your dog for more walks and socialize him with other well-behaved dogs. 
• Be sure he is neutered.