Hi I am new to this, but I have one bunny a holland lop mix and I was feeding her a baby carrot twice a day and she was having a problem with the soft Poo. The vet had me take her off the carrots and greens and give her just hay and her pellets (the Oxbow timothy pellets) and the poos went away. I have her back on the greens now but no carrots and no more soft poo! So it may very well be the carrots that is giving your bunny the soft poos. I did find that Oxbow has Critter Carrots and they are not supposed to have the sugar in them, my bunny (Buffy) loves them and I haven't had a problem with soft poos since feeding her these either. By the way, my bunny was pet of the day back December 15, 02 if you wanted to see her! Hope that helps!