Sirius was running late. He knew his best option was to go by feet. Four feet, that is. He took his dog form, and ran as fast as his little paws could take him. He maneuvered through the legs of the people on the sidewalk, and crossed the streets avoiding the massive metal machines that barreled down the roads. All was going well until he heard a loud whistle, and a man yelling "Stray! Catch it!".
This was an unfortunate circumstance. He couldn't change back to human form just yet, or else he might cause an unwanted panic. He was almost to Beverly Gardens, but he still had to outrun his pursuer. He had no plan, and no knowledge of the streets. He'd have to rely on his luck, which hadn't exactly been the greatest up until now.
He took a turn down an alley, and ran through exiting out the other side. That's when he saw his chance. A pick up truck was stopped at a red light, and Padfoot took a running leap into the back. Escaping.
He stayed in the bed of the truck until it veered off of the course of Beverly Gardens. He ran the rest of the way, until he showed up panting in front of Al.