John, I am so very sorry you have had to endure this. Decisions like that NEVER comes easy. Even then, it leaves a void that only time can heal. All of us at times in our lives, have to make decisions based on the "lesser of two evils" scenarios. This is no exception. You made the right choice so that your dog goes NOT suffer anymore than absolutely necessary. Either way, a tough one no less. I will, however, keep you in my prayers. If you ever need to talk, then let me know. Many of us here at audioholics are here for you John. Guys like you, is what continually makes this forum worthwhile in my book.
Cheers,
Phil