The puppies are going more and more outside now. I moved the grass to the far end of the puppy pen and it is actually working. The puppies are really going to pee on the grass on purpose. They of course also pee on the floor once in a while, but I think between 50-75 % of the indoor peeing is on the grass.
We had our first puppy buyer visit from abroad and luckily they really liked the puppies :).
The puppies are playing and they are still in the cute phase... so I will just enjoy it as long as it lasts :)