Aw, I'm so sorry. I know you lost a member of your family. I lost one of my pets two years ago. It is like being punched in the gut. I know you are mourning her loss, but time will heal wounds, and I can tell you gave her a good life.
It's difficult to come up with words when this happens. I know your kids are a big part of each day. I always remember, Our pets are God's gift to us, and how we treat them is our gift to God. You know you've done all you can for all of them. Be at peace.