My MiniLop Jackpot get's a icky poo bum too, and very often.
I try to give him less Romine. This has been an ongoing thing with us, and when we try new things and cut other things from his diet nothing seems to make a difference.
What I have found is Jacks so low to the ground, and just so big that he can't get at the cestrobes and they just mush to his bum.
it stinks, it's gross and i feel so bad for him.
So every couple of days I run warm water, cradle him in my arm, and just run the water over the poopy bum cleaning it up.
He is very good about it, and after I dry him off he is SO happy. He even trys some happy clean bum binkies LOL
So for us it isn't diet related, it's just the way his big body is, to big and to low. He needs longer legs
