Play with your cat twice a day for ten minutes with a wand toy or a ball. Hunting games prevent boredom and keep an indoor cat at a healthy weight. Give each cat its own litter tray plus one extra, and scoop it daily. A scratching post near the sofa saves the furniture from claws. Vaccinations, worming and a yearly check at the vet catch problems early. Cats hide pain, so changes in appetite or grooming are worth noticing.