Place peppers and onion on a large sheet of heavy duty aluminum foil and drizzle the dressing over the top. Fold the foil over the vegetables to form a packet.
Grill vegetables for 15 minutes or until crisp-tender.
After 6 minutes start grilling the hot dogs, grilling them until heated through. (Turn packet and hot dogs occasionally while grilling) this is also a good time to toast the buns if you wish to do so.
Remove the foil packet from the grill and cut a few slits in the top to release the steam, and then open carefully. Serve the hot dogs topped with the vegetable mixture