Reverse DNA look up? - Page 1

I have a silly question, but have been working with some "rescues" lately and became curious about these dogs unknown pedigrees.  I know that the AKC, SV and another registry in the UK do DNA testing to confirm parentage.  However what are the limitations of the service, I know AKC is swap and the SV is blood.  But these two points aren't my concern for the following questions:

Are these databases robust enough that they could tell what earlier generations a non-registered dog came from?  Also if these databases are robust enough will they send the pedigree for a dog 2 or 3 generations back without the parent DNA? 

I know its kind of silly, but there are a lot of dogs out there from backyard breeders and I would find it interesting to see who thier "grandparents" may have been in some cases.

No condemnations, experience or insights?  If its not possible or even a silly idea, I don't mind hearing it.

I would love to see this happen !! It may allow some people to look at there breeding program and see if there dogs are or are not ending up in shelters and rescues !! The problem is that not all animals are DNA'ed.    In the horse world, Arabian horses are all DNA'ed , and they are not allowed to be registered without it. It would be so awesome to have whole litter DNA kitts , and have it proved right from the start. 
My only question would be what happens when there is a Genetic glitch- there was a TV show where a woman was her own sister or something and she had split DNA .. this probably happens more often in dogs than people.

Whisper

I guess in regards to genetic glitches, some kind of qualitaitve methodology would have to be developed.  Thanks for bringing up horses.  I originally got the idea from an equine vet, who I was asking about arthritis treatments for horses that would also be good for dogs.  He said almost the same thing about reverse  DNA lookups for horses, so I thought I would ask around to see if there is any way to do it for dogs, even informally. 

I am curious about this as well. I have an 11 yr old male that just sired his 7th litter in April. He was never DNA'd, and I have had to send in his sample so that his litter can be reg. This is my question, he is 11 his parents where never DNA'd so how do they confirm his parentage?

The DNA requirement is not so your dog's parentage can be confirmed.

I understand this is why it exists.  However, there is are at least 3 large databases with the DNA and  enough dogs in these databases to devise something like I asked about.  Not only did I get this idea from the equine vet, I actually did it with primates in college as a anthro major and research assistant.  There are easily enough current samples to recreate portions of any dogs lineage, the problem is implementation and demand.