Title: Best one if you know secret
Review: I understand the poor reviews because of a tipping over problem. However, this one works best for my cat because it is wider at the bottom. I solved the tipping over problem by placing a 4.4 lb plastic weight that goes on a barbell inside of the bottom opening. My cat weighs 15 lbs and it works great. I'm sure not everyone will have a set of weights to use but could substitute something else.
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