...Or desk, while they do homework. Just make sure to supply them a square box or paper to lay on.

Food, a litter box and a few shots every few years and a cat will tend to take care of itself. This is good for a kid that may not be able to handle the responsibility of a dog (which will require more attention). There is no need to take them outside, or really wash them all that much either. A hands off animal for the most part.

Food for cats generally costs less and they eat less of it compared to a dog. So when it comes to financial concerns they generally cost less over the years, illness withstanding.