I purchased two toy/feeders, each a different color, for my two dogs. They know which color is theirs and I don't let them mess with the other. I have an 18-month-old and a 9-year-old. I started off with my more playful 18 month old and let my 9-year-old learn from her for a few days. They both picked it up within 10 minutes. Now when they eat, it takes them about 15 minutes to empty them out, depending on what setting I put them on. I think it's a lot healthier for them to eat slower and they really do enjoy it. Tails a-wagging!