I am sorry that you are having to deal with this...yes, several of us have gone thru this situation...and it is very hard..

But remember you are doing a kind loving thing for Roscoe, helping him cross that bridge where there is no more suffering and no more pain.

Allow your other 2 to comfort you..they may be doing what they can to ease your pain. I am sure they sense something is going on. They will miss Roscoe too in their own way.