I purposely put batteries in both puppies (I bought a set of 2) to test their performance as many reviews said the puppies didn't worked properly. Both puppies walked (both tile and carpet) but neither of them landed on their paws after a rollover - not once! This means that you should always pick it up and set it up properly again before playing with it any further. I had one with my son many years ago and he loved it because it kept working: barking, walking, sitting and rolling on his feet to start again. They don't do anything of the sort, despite the twist of attitude in the rear. I intend to see if the replacement solves this problem but I doubt it as BOTH puppies didn't roll around and land properly. Will update if I get different results. UPDATE: The replacements need to be adjusted (by turning the thing in the rear, which isn't easy, and you'll have to try turning both clockwise and counterclockwise to get a feel for what it takes to get it right roll and land on his paws) and after many tries the puppies landed fairly stable (on the carpet). When the present was opened for Christmas, the damn dog couldn't land properly on his paws! I have to say this is just not a good buy. Our 3 year old granddaughter didn't think of this gift other than that it was funny. for a full 2 minutes.
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