
Any vet can take blood samples needed for DNA tests, and should know how to go about it. They will normally have to send them off to the relevant lab. For DNA testing age shouldn't matter either, as the DNA will of course be there from birth. :) But do check with the breed club if they have any specific requirements -they may for instance want the dog to be microchipped so it can be made sure that the right dog is presented to the vet, for any official documents to be produced giving clearance.