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INTRODUCTION: The dog (Canis lupus familiaris) is a domesticated form of the gray wolf, a member of the Canidae family of the order Carnivora. T he word "dog" may also mean the male of a canine species, as opposed to the word "bitch" for the female of the species. Breeds are usually categorized by the functional type from which the breed was developed. The basic types are companion dogs, guard dogs, hunting dogs, herding dogs, and working dogs, although there are many other types and subtypes. It may be traditional breeds with long histories as registered breeds, rare breeds with their own registries, or new breeds that may still be under development.
1. Saint Bernard The St. Bernard Dog is a working dog from the Swiss Alps that was bred for rescue missions in mountain passes. It is a truly huge dog, standing in from 27 to 35 inches at the withers (the highest point on the back of an upright animal). Males can weigh anywhere between 73 to 117 kg. The St. Bernard is a very loyal and friendly breed. Although not an overly aggressive dog, socialization and proper training is required at an early age so that it does not become unmanageable
2. Mastiff The Mastiff (also known as the English Mastiff) is the second largest of all dog breeds. Males can weigh between 68–110 kg and their standard height is 30 inches. Although Great Danes and Irish Wolfhounds are taller then the Mastiff they are much smaller in terms of mass. Mastiffs are a muscular and powerful breed and they are renowned for their courage and dignity. Mastiffs are considered as one of the best guard dogs in the world and make for a loving and well mannered house pet.
3. Neapolitan Mastiff The Neapolitan Mastiff is considered as the 3rd largest dog breed in the world. Standing in at 26 to 31 inches this breed has a standard weight of 74 KG although larger specimens are common. Renowned for their fearsome appearance and protective instincts, this breed makes for a great guard dog. They need to be properly socialized at an early stage so they don’t become a danger for strangers.
4. Newfoundland Weighing in at 60 to 70 kg (males) the Newfoundland dog is the fourth largest breed in the world. It is considered by some as the strongest of all dogs and excels at water rescue operations. Newfoundland dogs are an extremely loving, patient and gentle dog that make for a great house pet. Its webbed feet and tremendous strength make it an outstanding swimmer.
5. Dogue de Bordeaux The Dogue de Bordeaux (also known as the French Mastiff) is one of the most ancient of all French dog breeds. French Mastiffs are powerful and imposing dogs. They have a fearless spirit and are ideal for guard duties. Dogue de Bordeaux rank as the fifth largest dog in the world weighing in from 54 to 65 kg for males with a height of 23-30 inches.