Second time I've had to do this, and it's not gotten any easier with age or experience. We've just had to have our lovely dog put to sleep before her cancer got any worse. Over this past weekend she stopped being the dog we knew, and was quite clearly putting on a brave face so as not to upset us, almost as if she knew we had this week off work, and would have time to mourn her. She may of felt small to me, having grown up with a much bigger dog, but she made sure you knew she was there. Countless times she'd storm into my room, knock whatever I was doing out of my hands and get a cuddle. She was a wonderful, loving dog, who'll always be loved, and will very much be missed.
Rest in Peace Tammy, we love you.