So this sucks at Christmas, my rather intelligent dog has been sick for sometime and he was given 3 - 6 weeks to live a while ago. He has been with me for 3 months since we got this news. He is now coming to the end, and I'm pretty sure he knows that we'll be saying goodbye the next time we go to the vet. So I'd like for him to pass on at home, and I'll probably try and do it while he's sleeping on my lap. Would a 22LR be enough to dispatch him, or should I use a 380? He's is an medium size mix breed his head is about the size of a beagle's head.