The list author says: "Adding another cat means products can become more important. For example, if you want a hooded litter box, a clear or translucent model is less likely to allow one cat to surprise-attack the other cat as it exits, leading to litter box avoidance - yuck! Also, a good scratching post is essential -- most cats dislike carpet because it snags their claws, but they will want to scratch SOMETHING and mark their territory even more after a new kitty arrives. A sturdy sisal post and some cheap cardboard scratchers can save your furniture! My cats haven't scratched the couch even once since I provided preferred scratching surfaces such as sisal and cardboard."
"Much better than cheaper fold-up imitations. Even my 13 lb cat can lie on it without it collapsing. The scratching surface lasts for a long time, and then can be turned over. Refills are available at any pet store for under $5."
"Currently there are very few pet fountains with a stainless steel *drinking surface*. This one is hard to find now -- there was a trial production in 2009 and according to the manufacturer, full production is planned for late 2010 or early 2011."
"Cat collars are very different from dog collars: dog collars have to be able to hold the dogs weight to control the dog, whereas cat collars are designed to break away when the cat is caught on something that could choke it."
"It can be hard to find an id tag small enough for a cat or kitten... if you can't find anything locally, google Lucky Pet PetTags. They also have collar tags that lie flat against the collar and don't hang down at all."
"Only my "dominant" cat will use this, but because there is no litter spilling out or tracking, it lets me place an extra litter box where I couldn't otherwise. I do clean it twice a day because I would hate for the cat to jump in and land in a mess."