[SWHouston]

I have no idea to what level that PetCo goes, with "their" DNA Test.

I rather doubt if it's actually "their" test, and not of some Lab somewhere.
"Standard" test will go to a tertiary level, and cost around $60-$80, but...
If you're really wanting to know about the Blood Line, then you need to
get a test that goes a LOT deeper than just three levels, and will cost
considerably more than the standard. One might check the AKC site,
and see which Test they "like".

You have to put a LOT of trust in a Breeder, when counting on the
PaperWork/Ancestry of his animals. A good copy of Photoshop on
your computer, and you can make your guys related to anybody !
Most Breeders have multiple animals, and just a minor lapse in their
"attentiveness", can cause an inbred or unwanted combination,
that they aren't even aware of. Not likely, but possible, and they'd
still be able to throw a very convincing array of Paper Work on the
table for you.

These two approaches (Registration-Ancestry / DNA-BloodLine)
to the validation of a "PureBred" animal, should complement each
other, however, until the cost of really reliable DNA comes down,
and time has passed to accrue that information on the breed,
all one can do is hope for the best.

It sounds like I'm making Breeders out to be bumbling fools, who'll
duff you into anything they just happen to have running around, on
four legs. That's NOT what I'm saying, the job of reliably researching
ANY line back more than 15 years is absolutely MONUMENTAL,
if not impossible.

I know one thing...
IF I had an Animal, with a CH, Trophies and all attached to it, and
did a real good DNA Test on it. I may not tell you that, and it may
be the worst thing that could happen, IF AKC started requiring DNA
testing on their show participants. That might put a serious dent
in the annual income of some Breeders.

At some point, maybe years away, there's going to have to be an
admission, that Technology trumps PaperWork.