My attempt at humor. I'd say it didn't quite work. Oh well. As always, I don't own it and don't hesitate to review.
Padfoot was running through a Muggle street amongst plenty of Muggles. He was young and he was strong and it felt good to be free. Not really thinking (he wasn't all too fond of using his brilliant mind on consequences), he barked gleefully and jumped on a small child. He was waving his tail happily, his great paws leaning on the kid's shoulders. All of a sudden, he got hit around his head with a heavy purse. The brat's mum was already shouting for someone to call the circus to inform them that a crazy dog must have ran away from them.
Confused, Sirius didn't dare to change into his human form, for all eyes were on him. He watched from face to face, waiting to see what was about to happen now.
An annoyed-looking man stepped over after what seemed like ages – and maybe it was – and took a look at him.
"Not ours," he spat. "Looks handsome though, might just as well take it."
"Just do so, I don't want my kids to be drooled over!" the woman raised her angry voice.
Sirius couldn't do much without giving himself away, so he had to just let the strange man put him in a van. He knew there was a circus in town; he was supposed to go and see a show with his fellow Marauders. Oh, well, he thought, there will be a time for that after this mess works out.
Then he was thrown out of the van and carried like a piece of meat in a brightly coloured tent. He was going to see the circus after all! But from a very different perspective.
There were some more men around him now, and they let him out of the cage. Curious, he waved his tail slightly; he wasn't afraid of those people. The closest one ordered, "Sit!" And Padfoot did so just for the fun of it.
"A smart one, huh?" Said the one who brought him here. "Let's see how you manage with something more… complex."
He was so smart, it seemed, he was going to be put on stage tonight. He barked when he heard it, glad for his five minutes of glory. When evening fell, he didn't hesitate to step on stage and show the people what he's got. With a couple of other, normal dogs, he preformed tricks and even had good fun doing it.
With his dog hearing he caught a sound of James, his best mate.
"Isn't that Padfoot? I wondered where he was!"
"Who would've thought," agreed Wormtail.
"Well, we should get him back! He can't get away unnoticed," said the always reasonable Remus.
After the show was through, and Sirius got petted upon, happy to have all attention, three teens entered the backstage.
"Sorry to interrupt, Mister, but that dog performing tonight, he's ours. Could we have him back, please? He apparently got lost this afternoon," explained Remus.
"That great black one, eh? He really yours? One smart beast you've got there," was the circus-man reluctant to let the dog go.
"yeah, he's ours all right. Come, Padfoot, let's go home," called Peter.
With one last looks at the circus, the boys and the dog walked out. "Some stunt you pulled there, Padfoot," smiled Prongs, glancing to his now-human brother.
