Based upon the criteria here's my small list. Of course more dogs could be included in the list. My choice is the Perro De Presa Canario. That's my preference. But I say that everyone should make their on choices based upon their research. Always research the breed and the breeder. When choosing a presa I narrowed my search down to the Presa, Cane Corso, Boerboel, and Dogo Argentino. I decided against the Boerboel because of the size being bigger than I wanted and wasn't going to be as agile or fast as a dog like a presa or the others. It is very agile for a dog of its size. I eliminated the Argentino because some white dog breeds have a genetic defect of deafness. I saw this was also true of the dogo. I didn't include the American Bulldog even though it is one of my top favorite breeds because I already was raising, breeding and training them. The Presa and Cane were so similar. But eventually I liked more of the Presa than I did of the Cane. Later I was happier with my decision based upon some trainer and breeders that I know that own or have owned the Cane Corso and the problems  they experienced in the breed. I met others that didn't have the same experience, but too many did.

List:

Presa Canario

Boerboel

Dogo Argentino

Cane Corso

Giant Poodle

Bandog

Rottweiler

Doberman

I know most people do not think of Gian Poodles when they think of protection dogs or bite work. But they can do the work. You just don't see it often. About 20 to 30 years ago when I was breeding Rotties and went to a Schutzhund club for some training for my Rottie pup. I saw a Giant Poodle. It was doing a long send out. It hit the sleeve hard. I'm not advocating this breed over any other breed. It is just an option. I know it has longer hair than short hair breeds. But allegedly the poodle is supposed to be a low shedding breed. But it does have more grooming needs.

Of course you could include some dogs like the Belgium Malinois, Dutch Shepherd, or Pit Bull. But they are too small for my personal preference in protection work. Again that's my personal preferences.

Speaking about personal preferences I left the Schutzhund Club. It was my preference to train my dogs for personal protection over Schutzhund. I still like watching Schutzhund (IPO), French Ring, etc. But I want a personal protection dog for myself. One of the the thing that attracted me to the presa was they are known to be able to accept your friend over if you accept them while remaining watchful and ready to defend it;s family if needed.

Normally I would have Recommended a dog like the Caucasian Ovcharka for cold weather climate as my top choice. I love this breed too. The main reason I don't have one is the long hair. They have a short hair version but it is not my choice. Then I would add the Black Russian Terrier, and Giant Schnauzer and maybe the Akita. These may all shed more than you desire.