REALLY :) You are great. The vet said exactly what you have said and even prescribed Equimax as deserthorsewoman mentioned.
The vet examined him, checked even his heart rate. He hasn't got ataxia or spavin. His spine is OK but because he is so thin, it looks that strange. I need to feed him (and he said that the present diet is good) and exercise him - lunge him and ride (especially uphill and downhill).
One reason he has lost weight so quickly might be the other horses and the way they were fed - very stressful situation for a low rank horse. He is going to be given AbPrazole Plus to help his stomach. I don't know whether ulcers are curable? He is regaining weight quickly, maybe there won't be the need to take him to clinic and perform gastroscopy.
These were good news for me. However, I feel sorry for him that something like that had happened. He lost over 100kg in a very short period of time. I feel guilty but little could I do because of Easter and this long may weekend in my country... :(
But I am really grateful because you gave me very precious remarks about feed, exercise etc.
Two weeks ago: