I bought two Puppies that Grow for my 4 yr old twin girls. They had seen commercials on tv and knew what the dogs were supposed to do. For the most part, they love them, but we had two problems. The first was that the girls wanted the puppies to know their names; when we tried to program them, one of my daughters' names was on the list that the puppy has preprogrammed to learn, my other daughter's name was not. It was such a bummer to tell her that her puppy will never "know" her name. Then, on top of that, the batteries in her puppy were low when the dog arrived so her dog never grew! It took me a while to figure out that that was the problem b/c the dog sang and moved its head and wagged its tail; it just never grew! So one of our puppies was growing day by day and the other just stayed little. I felt so sorry for my one daughter. We did replace the batteries after a few days and that worked.