I switched Lucy from RC Puppy, to Natural Balance (which she wouldn't eat after two days), to finally the Solid Gold Wee Bites. She loves it! She had no problems with the switch over and I switched her cold turkey and has had zero tummy upset from it so far. She's been on it for about three weeks and has gone from 3 poos per day down to one and they are smaller and odorless. For us, it works