The Meteorite is an item in Nintendogs that falls under the category of "Etc." in the Supplies. It is a kind of space rock, specifically a meteorite, that can be thrown around the room. It bounces when hit on the floor and can be found on walks. It sells for $150 at the Secondhand Shop. It is extremely rare. This is not likely to be a whole meteorite, as most real meteorites are larger than puppies.
DS: "This space rock most likely contains rare metals not found on Earth."