Cats will learn best with consistent rules and enforcement. Cats that are spayed or neutered automatically gain weight. Cats should drink milk everyday. Some cats can be lactose intolerant and milk will cause them problems. If you feed your cats milk at all, make sure it's in small amounts, infrequently.
Cats always land on their feet.
Make sure to secure any windows or balconies to prevent a fall. Indoor cats cannot get diseases. Get your cats vaccinated even if they remain indoors. Pregnant women should not own cats. This disease can cause problems to unborn babies.