I think 25kg. But I'm not sure any more! It is no longer in use with me! Not because it's bad, but I've noticed that my dog can hardly stand in it! That is, constantly bumping his head is not pleasant in the long run! So I decided to buy the Croozer! The price is not exactly a bargain, but there are big differences between the dealers! So do a little research!
I would recommend taking a close look at the dimensions of the trailer! Because if your dog can't relax in it, it's rather tedious!

Unfortunately I can't answer that, my dog only weighs about 12 kg. This information could be found on the Trixie homepage or on google.