I have a brand new bag of dog litter from Petco along with the medium sized dog litter box just sitting in my closet because that is all gracie would do is play with the pellets and run around with them in her mouth. I couldnt leave her unsupervised with it which was the purpose. So I finally gave up with the dog litter and now she just goes outside on a schedule. I wasted 25.00 on the litter box and dog litter and all Gracie did was use it as a toy. Tried it for a week..and no luck