Not actually true for two different and contradictory reasons.
A) It was actually something small and lapdog that was closest to the wolf genetically. IIRC it was the pommeranian.
B) The Wolf and domestic dogs (all breeds) are too close genetically to distinguish with any accuracy due to gentic variance and deviation. There are just no definitive genetic markers for wolf and any breed of domestic dog...
I've read that wolves are closely related geneticly to domestic dogs as you say. In fact The last I've seen is that most biologist consider them to actually be a single species with the domestic dogs being nothing more than the individual breeds rather than a seperate species. That said most veterinarians can find enough genetic marker to Identify different breeds although it's pretty costly just to find out what breed your mutt really is. One would think that if they can identify different breeds they should be able to identify wolf genes.
In any case I would have thought that the closest domestic breed to wolves would be the Malamute considering that breed was originally developed by crossing other sled dog breeds with wolves for stamina. I've owned a Malamute/wolf cross. I got her when she was 4 years old and had her for another 13 years until I had to have her put down. She was totally invalid at that age. Sweetest, gentlest dog I've ever had (towards people at least; she would not tolerate another female dog) She was entirely convinced that she existed just to be by my side. Absolutely impervious to cold or wet and her fur was to thick for fleas or ticks to penetrate. She suffered greatly from the heat when she got old though.
Last edited: