Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent for touchy systems

We first started using this for our border collie when he was only 5 months after trying to get his digestive system straight. Once we started adding it to his food (once per day, slightly less than the bottle calls for), it only took about two weeks to see a noticeable difference. He is almost three now, and no more problems. We also give it to our two others, just to keep them in top shape.