Imagine how youd feel if you knew your poor, loving, loyal dog was -ill- and you killed him for it.
I cannot imagine a bigger betrayal than that.
Listen to this song then go cry your guts out.
https://www.youtube.com/watch?v=YGnPj-Ty2Ew
That is derived from extremely old, universal legends.
http://www.snopes.com/critters/defender/babysave.asp