I'm so sorry to hear this.  I have tears running down my face as I type.  My canine companion is having problems and has been on tablets for a few months now - it's so painful to see animals suffer.   I know how it feels to lose a friend - I've had dogs as part of the family since I was a small child.   Fortunately there comes a time when you can remember the good times and smile, rather than hurt for the loss.

Gill