Re: Genetics of size for pups...Sire vs. Dam?
No way to know for sure based just on the parents. Depends on if the size of the parents is normal or abnormal for their families. If most of the dogs in the family (parents, grandparents, their siblings, etc...) are around the same size, than looking at the size of the parents to be a good indicator of the size the pup will grow to be provides a good guesstimate, but is far from a sure thing. If the parent's relatives vary widely in size, the genetics for all sorts of different sizes exist in the bloodline, and thus likely exist in the parents themselves, and you really can't guess how big the pups will be.