The term, "Responsible Breeders" signifies that the breeder has taken responsibility to do many things. One of them is to get a DNA test on their Volpino's before breeding or bought puppies from parents who were DNA tested for PLL so puppies would be OK. If one parent is a Carrier then puppies have to be tested before they are sold and given to the new owner. They should also receive a AKC and or UKC Registration Certificate.
A great DNA test is Wisdom Panel, it tests 211 DNA tests for health found in different breeds and compares the DNA to our Volpino's. It also identifies the breed, if it's a Volpino or a mix. It's important for every breeder to do this before they breed, to insure puppies will be healthy.
Here in America our club has known about PLL since Spring 2010. Italy has known about PLL since 1994 but no DNA test for PLL was available until September 2009. North American Volpino Club sent letters to Italy ENCI which is equivalent to America's AKC and all Volpino Clubs around the world to warn them that they need DNA testing before they breed.