I am so sorry for your loss!!!
I know your decision was not easy,I have been there myself...
Try not to feel guilty....you did a brave,kind and loving thing for your loved one,Dear Jock....

Jock will always be in your heart.....
Godspeed,Dear Jock.....
Ms.Puss will meet you at The Rainbow Bridge...She'll Welcome you and show you the ropes....
Go Run,Play and be Free of pain....Sweet Jock...

Your Pet Human will join you when its' time