That's so sad, Michelle, and I'm sure you will find yourself calling her from time to time. I did with my last dog. You can console yourself with is the knowledge that you gave her as good a life as you could. It sounds like you already have your hands full with your crazy boy!
I have an ailing dog at the moment, and I feel I am going to have to make a hard decision before too long. She is 13 and a half, has heart failure, and fluid in her abdomen and left-side legs. Despite that, however, she isn't coughing as much as she was, and doesn't seem to be in any pain - just very tired and dispirited. She spends a lot of the day lying down. The vet says I will know when the time is right, but I'm not so sure... she's still up for a bit of food scrounging, even though her appetite has lessened due to, I suppose, the pressure of the fluid on her stomach.