Very sorry for your loss Chuck,
They become such an integral part of your family and your daily routine that their loss is just as devastating as any other member of the family would be.
I also had a dog who was diagnosed with cancer about thirteen years ago now, a big Lab-German Shepard mix named Thunder, who was 130 lbs. fit and trim. He was eight years old at the time and it was a complete shock because it just showed up during a routine vet visit as a lump in his chest. We watched him have good days and bad days for two months until we had him put down. I think it was the toughest decision I've ever had to face, but you know in your heart when it is time for their suffering to end.
You and your family are in my thoughts and prayers.
Sincerely,
Mike