He used to be about 14.1 pounds (6.4 Kg) before DX, and went as low as 9.7 (4.4 Kg).
I think pre DX that was a healthy weight for his breed and I'm happy he's gaining some back.
I still don't understand how he hasn't gained more, he's been in healthy numbers for about a month now and he usually eats probably 30% more than he would need but the scale barely moves.