Belladonna is Italian for "beautiful woman" and, yes, they can be deadly. A lot of controversies surrounds the toxic plant. like people who consumed animals who ate the plant died. So please don't eat your puppy if it died due to the deadly nightshade.

Although they would be useful for nosy neighbours, I won't really consider planting it especially if there are kids around. But if you still want to go ahead, maybe this site can help you...
http://nepenthes.lycaeum.org/Plants...belladonna.html