!!Comatoa$ted spake. . .

>>> they just want to run with you

That's a great point. A dog that's interested in loping along with you will telegraph their intent to play by doggie body language. . .loping along in see-saw fashion and that doggie mouth-open-tongue-to-one-side "smile" thing. 'Course the danger here is some air-head with a phone up the ear will swerve to miss the dog and bag one of us. . .best not to encourage dogs running beside us.