Wait, you would put your dog down rather than have his toe amputated!? The hell is wrong with you?
The whole compassion for animals is nice and all, but I've always felt weird about putting animals down. I don't know about you, but I don't like to play God with things I love. To me, a vet saying that an animal needs to be put down is the same as a doctor saying someone with cancer has 2 months to live. Really? As with all things, it isn't black and white. I understand there are circumstances in which it would be "humane" to kill the animal. IMO, these are few and far between.. and having a toe amputated is definitely not one of them.
I'm pretty sure no vet would recommend euthanasia as opposed to a toe amputation.

And if they did, I would grab my dog and walk straight out the door.
In short, if all your dog needs is a toe amputation, he will be fine. Think of it this way - he's probably in more pain now than he will be after the wacked out toe is removed. If your dog is a dumbass, he may not even notice.

lol