It's been a while since I last saw this film, as a matter of fact, Pelle Svanslös is one of the first films I saw as a child. The story is about a Pelle, a cat who was born without a proper tail. Of course, Pelle soon becomes the laughing stock of the town, because the other cats think that "he can't be a proper cat if he doesn't even have a proper tail".
Since this is a children's story the film evidently has a moral. Fortunately it isn't overdone, and the message of acceptance and equality is conveyed without having to rely on cheap sentimentality. However, the film is a bit sad at times, mainly because of the abuse Pelle has to take from the other cats. Don't worry though, it all turns out fine in the end.
Still, I cried my our eyes out the first time I saw it. But give me some credit, I was only five years old at the time.