Boxer

A medium-sized dog, the boxer is affectionate, playful, patient, and all-around great with kids. They’re brawny and athletic, and look intimidating, even if they’re not actually aggressive. With training, however, this brindle dog breed can be great watchdogs. They have high energy levels, though, and need frequent exercise. Boxers are more prone to certain health conditions than other breeds, including mast cell tumours, ulcerative colitis, and heart disease, according to Petful.com.
Cane Corso

This name translated from Latin means “bodyguard dog,” and it has been bred to be devoted to its family. Also known as an Italian Mastiff, this breed is enormous, often weighing more than 100 pounds. Its short, stiff coat lends to its imposing appearance and, indeed, this breed can be aggressive with strangers. It’s said to be impervious to pain, as even electric fences won’t deter it, Petful.com notes. But with its family, the cane Corso is affectionate. For these reasons, the cane Corso is one of the best guard dog breeds, though not for first-time dog owners. Training is imperative to prevent the dog from “owning” its family.
Bouvier des Flandres

Don’t let the friendly appearance and gentle demeanour of these fluffballs fool you. With muscular bodies that weigh up to 50 kilograms, Bouviers are powerful and courageous, in addition to being super-smart. Thankfully, they’re also pretty laid back and loving when they’re just hanging out with the family, and will only become aggressive when a threat is imminent. They don’t shed a lot, but their fur can trap dirt and their beards can drip water, Orvis cautions.
If you’re looking for a pup that will be totally calm, read up on the best breeds with easygoing personalities.