Originally Posted by NdAppy
Ditto what Chiilaa has said.
On the DNA thing... it is not possible to do a breed wide search to try and match. You MUST either know the sire/dam to test against or the horse if there is DNA for that horse on file. There is no way to run a database type search. The registries are not set up for that, nor do I see them being set up like that any time soon...
There's no way to test the DNA to find a parent? Well that's a bummer...
I suppose the only way you're going to find anything, OP, is by contacting the former owner, and going from there.