I know to some people this seems strange. I've trained my dogs to run on a treadmill and as long as I own dogs and a treadmill I will continue to do this. There are nights or times when walking the dog is not as convenient as you would like or you may have situations like what happened to me last winter where an injury prevents you from getting out. There are those winter nights when the last thing you want to do is walk the dog through a blizzard or other bad weather. Having the dog run a few miles on the treadmill does wonders for their demeanor and gives them the exercise these bird dogs need. I don't see any difference between this and running them along side a four wheeler. The main thing is to get them the exercise these busy-bodies need. It prevents them from getting bored and destructive.
I usually run my dogs for about 45-60 minutes at 4-5 mph. Chief sometimes longer and faster depending on his mood. When my pudelpointer was younger she would jump on it and bark until I turned it on. She loved it. At 9 years old, not so much, she's hates the treadmill anymore and I slow it down for her after a few minutes to about 4 mph. I can relate.
There are a few videos on youtube on how to train your dog to do this. It takes some patience and you need to start slow and gradually work your way up to a point they feel totally comfortable. Within a few sessions your dog will get the hang of it. I don't like to leave them alone on the treadmill and I'm usually in the same room or at least in the vicinity while they are jogging. My treadmill is right next to our family room in my basement so I can watch T.V., play pool or video games while they have a run. It sounds lazy but it's effective. Just make sure your putting in the miles yourself. You'll still need to be able to keep up with your dog.