wow, I wish I had a good answer for you on this one. There are several companies that have jumped on the bandwagon with the canine DNA testing. Honestly, in my opinion most of it is bullshit and a money making scheme. That said, I guess there is some validity if you have a cross between two purebred dogs. If you start getting into a true "mutt" meaning a mixed breed breeding with a mixed breed, it becomes much, much more difficult. Honestly, I think proving parentage would be easier.