I know he has an outstanding fitness record at Rovers but he is still very young which i would say is probably the primary reason for this.
His body can recover from knocks much quicker than an older player. That said not missing a single game for someone who gets so much of "the treatment" is fantastic.

I think, like most on here, in the short term, Green and Murrell should be able to fill the hole, but over a period of time and against the big boys, we would miss Dobson massively.