We've had woodchucks on three (3) occasions. The first time was pretty cool.They were in an unused part of the yard and we would watch them from the dining room window, cute little bastards would stick their heads out of these 3-4 ft mounds of dirt.
I looked out there one afternoon and the neighbors german sheperd had one cornered. The little guy had went through the fence but didn't equate the other side of said fence with safety. That woodchuck held off that dog, (those things have some serious claws ) for a long time. I went out there and this woodchuck was panting and wheezing, about to keel over . I try to stay out of animal affairs (kind of a prime directive thing),but I felt so sorry for mr woodchuck that i shooed the dog away. The dog lost interest and wandered off, the woodchuck just collapsed right there. That was it for the woodchucks at that house, they just left- never saw one again. Had to till the area to get rid of the mounds and tunnels.