If you're talking about the retic bite I'm thinking of, I believe it bit and held. I think it got two arteries also. That bite could very easily have been lethal. If it had gotten a good solid grip with a few coils, he very well could have bled out. As it was, he lost a LOT of blood. As far as a comparison to dogs, dogs will usually do WAY more damage, just because of a greater bite force. I had a patient a year or so ago who had been SLAMMED by a police dog. It bit him on the calf and tore at least a pound of muscle out of it.
It's really a matter of differences in how they feed. Snakes have sharper teeth that are designed to grab something and hold it while they kill it. Since they eat their prey whole, there's no need for them to rip or tear. Dogs, on the others hand, don't usually eat their prey whole, so they need the jaw strength to tear into muscle and bite off chunks.
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