Recently, I adopted a ten year-old rescue dog. He just underwent a dental and had his teeth cleaned, but he still had terrible dog breath. I bought the Petkin Liquid Oral Care. This is supposed to clean dog teeth and freshen breath. You put a capful into the dog's drinking water. They are not supposed to be able to tell that it is in the water. It supposedly has no flavor or taste. I put this into my dog's water. I have four pugs. Not one of them would drink the water. All day, no water drinking. I was forced to remove this stuff and give them plain water. Dogs can tell it is in the water. They will not drink it.