You have three pit bulls? I would clear out my garage and bait it with some stinky fish or the like. Then when the coon came in I would lock him in there and let the dogs into the garage from the house. That would be the most entertainment I've had in months! Even if the coon gets into one of the dogs, the other two will rip him up so fast he won't have a chance to do much damage. Your only concern is going to be getting the dogs to give up their kill. You may have to let them eat it LOL.