I'm so sorry Kim, my heart is aching for you so much right now
I know how hard it is to see our best friends still wag their tails at us when life isn't all that great for them anymore, perhaps it's their way of saying "I love you so much, regardless of what you choose for me". Aw, I'm heartbroken reading this (but at the same time) will say a prayer that you are guided to making the right decision for Hoover right now...
You have given him a life that a lot of dogs can only dream of, he knows that now and will ALWAYS know it, no matter where he is (with you or at the bridge, patiently waiting to see you again one day). I hope you find peace in knowing how much he loves you and the life you've given him, regardless of when that last breath is taken.
Big hugs to you and your family, and to the old man Hoover
We're here for you, whatever your decision is...