Otto is an independent and clever street dog. He lives in a wastebasket under a streetlight and dreams of big bones. Like all dogs, he needs a lot of love and attention. He gets into of conflicts with ruthless car drivers, rich ladies with pedigree dogs or spoiled overbred terrriers. But what makes him really amiss are holidaymakers, people who simply abandon their dogs, the dog catcher and of course animal experiments. However, as Otto is a humorous dog, he finds an ingenious solution for every problem.