Are you sure those are even dogs and not lions? LOL

Nah that one dog must be a freak of nature, the others I saw have normal teeth pretty awesome looking dogs thou! I do not think these are for sale that easy.

http://molosserdogs.com/m/articles/view/951-serbian-defense-dog

http://nemanjaboskov.hubpages.com/hub/The-Serbian-Defense-Dog