You haven't told us about your background with dogs, so we have no responsible choice but to assume that you don't have extensive experience, especially with large or dominant breeds. If your situation is otherwise, you need to fill us in so that we can respond accordingly.
The bottom line about "guard dogs" is this: 1) an experienced dog owner rarely expresses a desire for a "guard" dog, being well aware that there are a myriad of mid to large sized breeds that are more than willing and capable of alerting and defending their homes and people; and 2) an inexperienced owner who is fearful, wanting a "guard" dog is exactly the wrong person to try to deal with any animal that is remotely dominant. They pick up on that fear and too often become either domineering and dangerous to the owner and family, or become paranoid bullies, a danger not only to others, but further perpetuating all those inane "bad breed" myths.
An "exotic" animal, such as a wolf or dingo, does not necessarily make a reliable guardian. They are wild animals, and as such, are going to act in their own best interests.
The best way to have a dog that is protective of you, but not difficult to handle, is to first do some research, not only into different dog breeds, but how to socialize and train a dog, then go to your local shelter or find a breed rescue and find the adult or young adult dog that shows confidence and an affectionate nature. They know that you've rescued them, and if you make them a part of a loving home, will never forget it and will defend you and your home, even with their lives.
There is no better guardian than a well-loved, well adjusted dog.