Oh I am so so sorry for your loss. Of course I don't think you're irresponsible, these things happen, and such small creatures are so fragile there's probably nothing you could have done. When I brought my mouse, Q, home, we played with her all morning, and went I went back to check on her in her cage in the afternoon she had just laid down and died. Like you said, it's all so sudden.

Perrie was such a little fella with such a big capacity to be loved. He's playing happily now at the RB. I'm so sorry to you Britt. Feel better.