A dog does not have to ride on the hood or the bow of a boat. I have seen them in a box & they will rig out of it. I also would call any dog that lets you know there are hogs around whether it is by whining, jumping up or down, or barking, if they are letting you know they smell hogs, they are a rig dog. I have had mine rig going 75 mph down the interstate & they all sound off.
X2 on what Cajun said...my dogs will open up going down the hiway where I know there are hogs on each side of the road...
Training a dog to rig is fairly easy...but I don’t train for it because I know my dogs will naturally rig when on the 4 wheeler...all we need to do is always pay attention to what the dogs are doing and encourage the dogs when they are doing what we want...
We can call it training or taking advantage of an opportunity...if cruising down a right of way and the dogs smell pig encourage them to bark a time or two and them cut them loose...your dogs will be on their way to being rig dogs...