Hairballs are a common cause of death in rabbits. They groom the same way cats do, by licking their coats. The difference is the rabbit does not vomit up the hair that was ingested. This is a major reason for hay in their diet, which creates the fiber to prevent this problem. You may also use cat hairball medicines such as Petromalt or Laxatone once a week and daily during their molt.
Exercise is also important.
See your vet as soon as you see any of these symptoms. Diarrhea in rabbits can also be fatal. If it is runny, messy or smelly see your vet immediately. If you hear loud rumbling from the stomach, see small or misshapen droppings or no droppings at all make sure you see your vet. Never let a veterinarian give your rabbit amoxicillin, which is a pink liquid antibiotic that smells like bubble gum.