The dogs that work with forces like Navy SEALs have their canine teeth (their four fangs) capped to prevent or repair the damage that can be done to a working dog's teeth. Those canines wear down fast, especially when you're training a critter to do things like bite body armor.
So they get their fangs capped. With titanium or stainless steel. Gold and amalgams aren't strong enough to withstand the bite force of a big dog.
Who's a good boy with beautiful white teefies? Who's a gooood boy? Who is? You are!
(I, for one, welcome our titanium-toothed canine overlords. I hope Kong has a toy for this.)