The disk can be used in the house, too, for sick rabbits and in the carrier for a trip to the vet. (smallanimalchanel.com)
If you introduce new foods too quickly, or feed inappropriate food choices, the rabbit's normal digestive flora (normal bacteria) will be disturbed and may lead to a sick rabbit. (cedarbayouanimalclinic.com)
If it is after-hours and your regular veterinary office is closed, take your sick rabbit to the veterinary emergency room. (texvetpets.org)