Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The Best Dog Shampoo

This is our favorite. We have two Golden Retrievers and Vets Best make them clean and smell soooooo good! I always dilute this just a little because it is very concentrated, but mostly because it's EXTREMELY EXPENSIVE (why is dog shampoo more expensive than mine!), so I use it about every other bath. All of the Vets Best formulas are very effective, but we just LOVE the scent. Wish this was more affordable so I could use it all the time.