mine weighed 1.2 lbs an 12 weeks, yes she was tiny, im guessing she was the smallest of the litter, but she was healthy and jumping all over the place, she shes 20 weeks now and still strong, just a little skinny but im working on itYeah, it's not so accurate. Spot on for one of mine but the other one has just jumped all over that chart. 1lb at 12 weeks is very tiny. I don't think I would personally be comfortable with such a small pup. At 12 weeks they are zooming all over the place (when they're not sleeping) and you would have to watch it like a hawk to make sure it didn't hurt its self.