Hello again, and thanks to everyone for your replies.
As from today, i am adding poop from the healthy horses under a little bit of straw to encourage him to eat it.
Tomorrow the farrier is coming to check on him, and propably he will get horseshoes on.
I have some more picture for you.
This is what he has to eat..
I also have bought this supplement. At the vet pharmacy they told me that it will do him good. The guy that owns the farm says that we should wait until he is ready to get some exercise, so he will have more energy. Is anyone familiar with this one? What are your thoughts?
This is a picture how his poop is like
And finally here are some more pictures of Achilleas, after one month that he has been in our care.