Instruct: Classify a given review into positive or negative sentiment.
Query: Excellent Dog Shampoo

I have been using this shampoo since my 9-year-old Shi Tzu was a puppy. When the pet store stopped carrying it, I searched high and low until I found it on Amazon. Other pet shampoos I have tried simply do not do the job as well. With this shampoo, Harvey smells clean (but not perfume-y), and stays clean much longer than with odor control shampoos. I would recommend it to anyone.