We have multiple dogs. I was looking for easy way to help with dental care. Bought the water additive and spray. First they lost my order and I had to get PayPal involved to even get a response. They FINALLY sent the product. Started using it after making sure was safe for dogs and cats. Used as directed in the water. 24 hours later we have massive diarrhea. Additive was only change in the dogs care. Took 4 days to get normal poop again. Decided to try the spray in 4 adult healthy dogs. DIARRHEA again! Stopped and normal poop. One last attempt but I gave it 10 days to allow dogs systems to adjust. 2 did finally start having normal poop but the others had diarrhea. I requested a refund for the 2 unopen bottles. NOTHING. This product is terrible and so is the customer service. DO NO BUY!