[topknot]

No that is not the case - you cannot go by size of stud. You do have to look at the studs parents and I even check out grandparents. Also siblings. A 4 pound stud could have a 12 pound brother and parent. So don't be mistaken by the stud's size itself. I like to see championships in there for the stud, and its parents, etc... The more champions the more I can research. If you do not have championship - it is left up to the stud owner telling you. In other words the less the champions the less you know. Also a 2 1/2 pound stud - you may have problems with the breeding itself. Harder for him to reach unless you do AI. And why would you want one that tiny? Yikes! If I am going to breed I am going to breed to the best I can. So I look at the standard. Also check pedigrees and health. You want the best match. What are the studs qualities? What are the bitch's qualities? Never double up on faults. I hope this helps. There is so much to breeding and you still might not make a best match, when the pups come you'll know later as they develop.