Squish, two months ago I had my six year old dog put down. That thought of "I'm killing him too early" went though my mind so many times.
But now that it's done I'm glad that I did it when I did.
I don't have memories of him being in huge amounts of pain, or unhappy, or anything else.
It is SO hard to have to do this, and I'm sending you hugs!
But please, in the end, please do whats right for your dog.
Love and hugs!