My favorite type of dog has to be the German Shepard. I've had German Shepards all my life and they are the coolest. They are really nice to their owners and they don't take any crap from anyone or anything.
A puggle because they look mad awesome! Or a shiba inu because they look like wolfs and they own! Or a golden retriever.. All dogs own! yeah! (Cats stinks)
They can all be, it just depends on how you raise them. My dog is about 100 different breeds, but shes sweet as can be, never bites you as long as youre allowed in