Sometimes dogs are just jazzed by our feet turning on the pedals. It's hard to know, unless you are experienced in reading dogs. I even get surprised sometimes at the dog parks.

I have a funny cat story (thread hijack warning). Post surgery, I had to walk. I would walk up my street and the neighborhood cat would join me. He had a self-proscribed boundary. If I ventured beyond his boundary, he would grab my leg with his teeth & claws until I turned around. He is also the kind of cat that doesn't move for cars. He lays there & looks up like "So go around me!" Thankfully, this is a very quiet cul-de-sac and everybody knows about "Grey Cat."