"Die Pluster-Kätzchen" is listed as an alternative title here, while "Welpen retten die davongelaufenen Kätzchen" is the main title of the episode. Nothing to change here.

I would disagree with this: Main and alternative titles seem to be mixed up at fernsehserien.de. These "Welpen..." titles never seem to be the main titles. But most important: For example "Die Pluster-Kätzchen" is the title shown in the episode itself: https://ibb.co/Zzv34d4

So I suggest to replace the "Welpen..." titles with the one from the episodes.

"Die Pluster-Kätzchen" is the title shown in the episode itself: https://ibb.co/Zzv34d4

This is good, but this is not necessarily the original German title. We need proof that Die Pluster-Kätzchen was used when the episode was first released in Germany.

I know this doesn't necessarily have anything to say about the title during the first airing, but the episodes are being advertised with the longer name on the official Nick JR. website: https://www.nickjr.de/tv-programm

https://i.imgur.com/SNnrRg5.png