My dog is on it as well. They said it was on back order until Jan. but after searching online it said they discontinued making it. I confirmed this with my vet and they said yes. They now have his tubes specially made, it takes about two weeks to get it. The price went up big time, from $36 to $53 for this very small tube. Murphy has to have it though, he has an eye condition that without it they say he could go blind. It has been working great for him. That would be great if it really only was on backorder...anyone else heard of it being discontinued?