A few years ago I bought some Hartz Ear Cleaner for my dog. Within a week one of his ears was bothering him. I took him to the vet and to my surprise, he had infections in BOTH EARS! They were so bad they had to use a camera to look inside them! I will NEVER use Hartz Products again. I have warned and will continue to warn people about them. Dogs can die from ear infections if they are severe enough. I’m glad I took my dog to the vet when I did!