Figuring out adult weights on puppies can be really tricky! There is a lot that can change their adult weights, including the size of the litter, their nutrition after weaning, activity levels, their parent's genetics, and whether they're fed a diet with a lot of treats. I do my best to estimate the adult weight, but I can't make any guarantees. Nevertheless, everyone seems to know what weight their puppy will be, so I have attached the chart that I use. 

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Weights get more accurate the older they get, and there is very little accuracy before 8 weeks of age.