Originally Posted by Yota Bill
that sounds like my chocolate lab. If he is inside, and happens to see a bike go by the house, he starts barking like mad, even more so then if someone pulls in the driveway, running back and forth between the door and the picture windows, whining loudly and seriously trying to get outside. If I have him in the truck and see a bike, I have to roll the windows up, he has tried to jump out before, or at least looked like he was thinking about it.
Saw somebody on the sidewalk riding a Segway one day while I had the dogs in the truck with me. He was a bit confused, but still wanted to "get" them.
Sounds like your dog needs some obedience training. We have a small dog and he does that when I am not at home, because my wife lets him. When I am home he looks to me before he makes a move.