[MilesDavis]

I just recieved a phone call at work saying Miles' sister died this morning (my a co-worker of mine bought his brother, and her parents bought his sister...thus the reason I was able to be notified). They all just turned a year old in March, so clearly she died very young. From the information I'm getting, the vet is saying she had some type of autoimmune disorder, they were going to do a blood transfusion, and she died right before they were going to take her in for the procedure. My co-worker said something about how her own blood was essentially attacking her body.
Needless to say, I'm freaking out. We'll get more info from the vet later, but I was just wondering if anyone had any experience with something like this. I'm hoping this isn't something that's hereditary. I don't know what I would do if I lost Miles.