I was having problems with both of my dogs throwing up almost every day. I took them both to the vet and did all sorts of tests. Everything came back perfect.. We tried EVERYTHING and nothing seemed make any difference. I was skeptical that this would work, but I was willing to try anything. I bought two bottles and within 2 weeks, we started noticing that it wasn't happening quite as much (both dogs). Within a month, it was a lot less frequently. They have been on it 8 months. I think they have only thrown up 2-3 times in the last 6 months. Even better, I didn't have to buy the most expensive brand for this to work.