There are a number of reasons your dog may develop behavioral problems that cause them to damage your fence. They could suffer from separation anxiety when you leave for work each morning. Each dog reacts to anxiety differently, and some dogs will scratch and claw at objects as a form of relief — and your wood fence may become the object of their behavioral issue. They may also attempt to escape by digging underneath your newly installed fence. Maybe they react to visual cues outside of your property and are “set-off” by other dogs or wildlife.