Ive tried tons of different types, hes just not interested, he fills up on pellets so isnt bothered about it.
Yes its the pasturella the infection has been so chronic constantly fighting it is making him loose weight. It has been better recently but he's had 'active' pasturella since November last year
Oh dear poor little love.
It may be worth having a bit of alfalfa hay constantly available, because it is generally considered very yummy by buns because it is high in nutrients. And even if he just has a little nibble it will be good for his teeth but also good for building his weight up. You could mix some in with his pellets.
Will he eat greens?