You are kidding, right?  I love my dogs, but as soon as they started to lose their dignity, I put them down.  If a domesticated German Shepard lived to 13 years, like, mine did, that's a good, long life.  She was spoiled and loved and we still miss her, but when a dog's time is up, it's up.  Its in her best interest to be put down in dignity.  BTW, I am a city boy that grew up in Philly and now live on the beach in Florida.  I'm not a farmer with livestock to lose.  But, equating very old wolves that kill livestock to shooting a Grandmom, is very, very stupid.  I don't get that comparison at all.