I have personally met two of these dogs, many years apart. The first, a male, stood a few feet away and did a low growl when he first met me, not aggression, but it was made very clear he'd tear me up if I messed with his "family." After a few minutes he calmed down and I petted him a little bit. The second, a female, seemed shy around everybody, even putting her tail between her legs. You have my permission to take this with a grain of salt.