Many thanks Dr Dan, your advice has been very helpful.
Just one small point Dusty does not appear to be in pain. We have felt around his jaw with a little pressure and he does not flinch at all and he chews with vigour so a bit puzzled so a comment from you on this point would be welcome
We are now grating/blending carrots and cabbage and he eats this OKish
However, all your points are well made and noted