The most expensive thing we bought for the dogs was the huge kennel outside. We paid $100 for the thing, bought a doghouse and cemented the whole thing in. It is pretty big, completely safe, 6 foot chainlinked walls and ceiling, cement floor and a huge roomy doghouse....we originally thought instead of putting the dogs in crates while we were in school/worked they would enjoy being outside on nice days. The first time we ever put Micki and Mini in the kennel the whole thing was a disaster... the squirrells decided to sit on top of the kennel roof causing my two squirrell crazy dogs to go nutso, the neighbors ended up calling the animal control and we were left with a warning because our dogs were "disturbing the peace"...I could see this as a problem if it was early in the morning or late at night but this was in the middle of the day!! So they have never stepped one foot in that kennel again, I'd say it was the most expensive thing we have gotten for them and not been able to use. We did put Jack and Sassy in there together last week because they are relatively quiet, there were some old car seats in there that my dad took out of a derby car, we got home and Jack shredded the whole seat....he will never be left in there again. Oops, kinda got carried away, sorry I wrote so much, I know it was a simple question...