Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to know if your cat is sick [title] Pay attention to how much your cat sleeps. [step] Sick cats will sleep more. If your cat doesn't have other signs of illness, such as vomiting, diarrhea, loss of appetite, or obvious swellings, then keep him/her under observation.

Ending1: Also check your cat's nails (overgrown or flat). If your cat gets loose nail-biting, play fetch, tug of war, and other fun activities with your cat. Ending2: If symptoms develop, get him/her checked by a vet. [substeps] If your cat isn't showing other symptoms, monitor him/her for 24 hours (of course, it's fine to get her checked by a vet before this if you are worried). Ending3: Be prepared to check your cat's bed for bedsores and swelling. Shaking can also indicate that something is seriously wrong, and should be checked as well. Ending4: [substeps] Sickness can indicate, from the leap, that your cat is ill. If the fever is so severe that his/her body can no longer perform functions that normally would not suit it, you should keep your cat in an observation room.

Answer format: ending1/ending2/ending3/ending4