Ugh. I'm crying now too... this is bringing back memories of Putting Maple to sleep. He was my love for 17 years. And he didn't fight it at all either. I was expecting him to gasp and twitch like the vet warned me and I had seen hundreds of time with mice being euthanized. But he didn't fight it at all. In a way that makes me feel like I made the right decision because when he was healthy he would launch himself at vets and try and rip their faces off... he was such a badass with everyone but me.
And on another note I just DON'T understand how people choose not to be there when they put their companions down. The vet was all surprised when I didn't want to leave. It just... baffles me and hurts me.