The Cat Tunnel Sofa by Korean designer Seungji Mun combines a comfy cat-napping couch with what appears to be an inside-out hamster habitat. You might still be a couch potato but at least your cats will get some exercise.
Cat hairballs present a common problem for the average cat and his owner. Cats tend to shed more frequently than other animals, and clean themselves on a regular basis. This causes their fur to gather up in their stomachs, eventually resulting in hairballs.
There's a lot of competition in the pet sitting business. To be succesful, you need to stand out as a professional. One way to do that is through pet sitter certification. Here is an overview of a few pet sitter certification programs.