Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do Not Buy!

I have used this product on my dog for years and it always worked miracles. However, after I started using this particular bottle I noticed that my dog became extremely itchy. After a trip to the vet I learned that this shampoo was the culprit to an allergic reaction and the cause of hair loss on all 4 of his paws. His poor little tail was so swollen from biting at it and he was even losing hair under his face from scratching. Once I stopped this product the issues went away. Again, I never had any issues with this product in the past and I wonder if I really bough Malaseb or was it something else?!