if the breeder knows size of parents and grandparents its very helpful. i say through out the chart, its genetics.....my lil one was littelest in litter and i know the smallest can end up being the biggest in any breed. So next time do your home work and ask alot of questions, especially if they have parents and grandparents, see their pedigree and pictures, ask for weights and at what age. That is why my next male will be at least 6 or 7 months old, then i know if he is staying cobby or getting longer........Brittany