Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Changed Formula for the WORST

I've been using Petromalt for years now and my two cats love it...or I should say USED to love it. Now, with the new tube and new formula they actually run from it. They knew before I did that something wasn't right...then I had an old tube lying around and compared the ingredients...totally different! My cats were smart enough to run! I'm going to return these two tubes I purchased and never buy Petromalt again!!! I'm on the lookout for a comparable brand out there to the old Petromalt ingredients...anyone that has any suggestions I'm all ears!