Give your rabbit lots of roughage, clean oat straw or weed free
timothy hay. Check your pellets for contamination, maybe throw them
out and get a new bag. You can give your bunny kaopectate or pepto
bismo, a few drops at a time. Make sure it is common diarrhea and
not mucoid enteritis. Mucoid enteritis can be detected by gently
shaking your bunny. If it sounds like it is full of water mucoid
enteritis is present. See a vet immediately. Mucoid enteritis is
usually found in young bunnies.