It is extremely unlikely that the heat disk had anything to do with this cats death. In fact it probably helped him to live longer.
They only type of heat that is deadly is being locked an a car in summer.
Please don't beat yourself up. You did everything humanly possible to help this dear cat.He was just elderly with unresolvable health issues and it was his time to go.
Please go to
www.petloss.com and read the rainbow bridge. I think it will comfort you.
You can sleep well tonight with no guilt. You did the very best that anyone could do for this dear elderly cat. And believe me, somewhere on the rainbow bridge, he knows it.
Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri