I have a 5 year old generally well behaved beagle but now he's driving me crazy!! We are pretty sure there's a groundhog living in the creek on our property just beyond his invisible fence line. He has been barking continuously for 4 days now when he's out back. I have tried praising him, then I put deer repellent thinking it might cover the scent he's tracking, and we even took off his invisible fence collar and took him on the leash to track the scent last night. I don't know what else to do.. any suggestions?