Thank you all for the support.
Unfortunately Leo just passed away at the hospital about an hour ago. His temperature had dropped even lower and they were going to do some more blood work, but in vain. He died after being administered morphine and it was very quick. I've dealt with many deaths so (unfortunately) I am used to this. It still sucks though especially because it was not his time.
I may or may not post the WHN today - don't feel like writing but it may keep me busy. We will see!
Thanks again everyone and give your pet(s) a kiss from me!