Great potty pad tray for the tiny little ones! The ledge is small enough for my 1.5 pound Pom/Yorkie mix to get in and out of with ease and she seemed to take to it right away without any training! I just put it in her pen with her and when I returned home from work, she had already figured out that the tray was where she needed to take care of her business while I was gone. The pads are super absorbent and lock into the tray to keep them in place for the curious puppy who may try to chew or pull at them. Great product for the little ones that are not always easy to find the right size products for!