You need to do a elaborated research and grab some books containing info about large breeds. There are a lot of books involving breed selection and breed behavior.

As much as possible, list your requirements for big dog breeding and its responsibilities for proper care. The size is no longer debatable, apart from the bog dog’s attitude to the children, trainining response, exercising needs, etc.

Female big dog breeds are more desired than males since females are smaller breeds. An added matter to note about big dog breeding is the training, walking, grooming and alimentation.

Regarding the multitude of big dog breeds, it’s important to mention some of them:

Great Dane
– between 130 to 150 pounds in weight;
– 26 to 29 inches in tallness;
– origins: usually viewed as a guard dog and hunting breed in some countries;
– friendly with kids;

St. Bernard
– between 149 to 165 pounds in weight;
– 24 to 28 inches in tallness;
– origins: previously considered as rescue dog breed in the Alps areas;
– tolerant, calm, friendly;
– they possess thick coat and shed heavily;
– easy to train;

Newfoundland
– between 113 to 148 pounds in weight;
– origins: considered as a rescue and carting dog breed in the Newfoundland community;
– they must live in the house, although they are highly dynamic outside;
– they are not considered perfect guard dogs;

Alaskan Malamute
– between 76 to 111 pounds in weight;
– origins: sled dog breed in Alaska;
– rather aggressive and dominating character;
– difficult to train;
– they are predisposed to nanism.

Mastiffs
– between 169 to 198 pounds in weight;
– origins: considered by the romans as a war dog breed, despite their dignified, calm and behaved posture;
– they are somewhat hard to train, because of their size and their stubborn character;

There are other big dog breeds left to enumerate: the Scottish Deerhound, the Rottweiler, the Borzoi, Akita, Bernese Mountain Dogs, the Irish Wolfhound, the Bullmastiff, German Shepherd, the Great Pyrenees, etc.

An important note to consider when going over the big dog breeding matters is to participate to various dog exhibits and get oppinions from big dog breeders: their meaningful and concise information will greatly help your dog breeding venture.