Better approach is "dogs kill people". If your dog kills your baby, you should not get away with some bs excuse like "it never did it before". You are still responsible, and you should get a life in prison!

I'm sorry but no, you should not get life in prison if your dog kills your baby without warning. In that horrible scenario, it's punishment enough that you've lost your baby and that your dog did it (and consequently you've also lost your dog). Not every tragedy is a human's fault.