Garage doors themselves weigh several hundred pounds. The torsion spring does most of the work of lifting the heavy door so adding 20-30 pounds is nothing when compared to the overall weight of the door itself.
Thanks everyone. He seems fine this morning. No bruising on his bum. He is moving a little slower but that is a good thing considering he runs everywhere. He was ready to hold hands before we even.went out to the garage this morning. Yes, opening the garage after they are in the car is an awesome idea.