Probiotics can be helpful for poopy butt or during and after rounds of antibiotics. If your bunny is on antibiotics, give benebac an hour before or after medications. Bunnies like the flavor of the gel. Use the measures on the syringe to give one unit per day. If the bunny doesn’t gobble it up, smear the gel on the foot and your bunny will groom it off. You can also use the powder version of Benebac.