Bottom, bottom, bottom... gotta stick with 'em.
If a dog was biting me on the nuts... i'd be running faster!

Some hogs a good nut dog will work well on... but some it will kick into high gear and they'll leave the country.
If they are straight running soon as the dogs get them up I dont know what you would do with a nut dog. The hog will have to stop at some point for a dog like that will help. You just have to persistent and you'll start getting them stopped.