I'm so sorry Carmen. Reading this thread has really made the tears start welling up. I still remember your beautiful photos of Rosie and Luma at Texas A&M. It just seems so unfair to see her gone so young.
I went through some of the same feelings of guilt you did with Rosie. For a couple of months I'd always be thinking 'how could I not see it with Minnie'. And I'd beat myself up for noticing her athleticism and speed had dipped a bit. And then things came crashing down all at once like with Rosie (except it was kidney problems with Minnie). It just seems so natural that we have to have someone to blame when something bad happens, and who better to blame than ourselves? Well, that's garbage. We both loved our pups so dearly and both would have done anything for them. It's always so easy to know things once they're in the past.
It's definitely not good to hold in this kind of sorrow, so it's good you can cry and can come here and talk about Rosie. It just has to hurt this bad to lose someone you love so much. I wish I could tell you a way to dull the pain, but the only thing that works is time, where one can see the bigger picture and start to appreciate all the great times together.
Sending virtual hugs, Carmen, Tony, and Luma.