An assembly and method for conditioning a pet to utilize a toilet when making waste. A primary tray is provided. The primary tray has a first depression, wherein a primary opening is formed in the depression. A plurality of inserts are provided. The inserts progress in size. Each of the inserts defines a central opening that is proportional to the size of the insert. The primary tray is placed on the toilet. The primary opening within the primary tray is covered by the inserts. Litter is added into the depression of the primary tray to entice the pet to utilize the primary tray as a litter box. Over a period of time, the pet will become accustomed to jumping onto the primary tray to make waste. The inserts are removed one at a time. This slowly uncovers the primary opening over a period of time as a pet is conditioned.
