Oh no, this is so very sad. I first met Bill when Ozzie was a pup - he had signed up for a Jim Van Engen seminar in Wisconsin. I enjoyed getting to know Bill and watched Ozzie's career blossom over the years. I'm so very sorry - blasto is a dreadful and insidious disease.
My sympathies to Bill and family and friends of Ozzie. He was a really neat dog.