Most of our quarry, opossums, raccoons, fox, porcupine, skunk, take up residence in groundhog burrows. Fox will excavate the hogs home to make a little larger. Raccoon live up in hollow trees also.
Raccoons are very formidable quarry, I've seen them give a very good fight when confronted. If a dog goes in hard, you are going to hear alot of action. And yes, they will lock on. Seen it alot. If the dog is more of a bayer, the raccoons will usually stay in place until dug to. Raccoons don't dig away unlike the groundhogs. Depends on the pressure the dogs want to put on. Above ground