How tragically awful for you. My heart goes out to you. I hope you are able to find answers and that you will share them when you do. Don't torment yourself with coulda, woulda shoulda's though. Like Jeff, I'm thinking of having full bloodwork done as a result of your post. I think all of us ask ourselves if we are doing enough with the diet, the vet, etc. etc. In the long run, I think the forum members do the very best they can. As several of our members can tell you, it isn't always enough. God bless!