i had that happen the other day, i was cycling and this dog came bolting at me, but i had enough speed so he couldn't catch me, unfortunately the road was a dead end so i had to turn around... and there the dog was waiting in the street for me to come back. I just sat there for like 10 mins till the dog got tired of waiting and went back, of course when i went by again, he came a bolting down for round two. There was also this cute big fluffy dog that looked kinda dopey, but he just looked at me with a "hey you gona pet me" look on his face.