pick which pups you believe are from the sire you're wanting pups from, and then get them DNA tested along with the parents. to get 4 dogs DNA tested (both parents & 2 pups) will run you around $150. i had some pups tested earlier this year, and was happy with the service provided. if you want more info send me a PM and i will give you the website info and try and answer any questions.
TY, will do