I used to tie my dog that way, thinking that I wouldn't forget. Then I read about a woman downstate who set her baby in front of her car in his babyseat while strapping the kid's older sibling into the car... then drove off, forgetting about the infant in front. She went about a blockbefore somebody stopped her... luckily the kid was unhurt.Not as bad as tying your dog or horse to the back bumper...and forgetting. I've seen both and it breaks your heart.
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I still tie my dog to the truck if necessary, but the other end of the rope is attached to the steering wheel.