Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ear infection

I owned a cocker spaniel who just passed away this week. He had chronic ear infection, and I used Epi-Otic for a long time to keep both ears clean and fresh for him (it was his vet's suggestion). The vets couldn't see through the ear canal, and they didn't realize that a tumor was developing inside one ear, because it seems like Epi-Otic can't take everything off. As soon as I changed to another product, the ear canal was free and the vet could see this tumor that was already too big and very close to the brain, and when my dog went for surgery to remove it, he passed away...it was too late.