It is the excellent portrait of a house guardian, the Giant Schnauzer has a strong and brave silhouette: its build is strong, robust and genius disposition which give it an outstanding as a partner and guardian. 
A true working dog, with almost square proportions, the Giant Schnauzer, the largest and most potent of German Schnauzers, is a robust and active dog. The male is between 64 and 68 cm; the female 5 cm less (the FCI provides a size for both sexes, from 60 to 70 cm in height to the withers); the medium size is preferable over too large or small specimens. The head is strong and rectangular, with the skull moderately wide between the eyes; the cheekbones smooth; the muzzle strong and well filled under the eyes; complete dentition with scissor bite; the ears docked or not, high inserted, natural in ā€œVā€ shape. The neck is medium length and well arched; the body short and compact; the shoulders smooth and somewhat sloping, forming a straight angle to obtain max. reach; the withers high; straight forelegs; quite deep chest; well closed elbows. The chest medium wide, wide ribcage, noticeable sternum; the tail high inserted, docked to the third vertebrae. Hindquarters no higher than the shoulders; good angulations; cat feet, well arched. The coat is hard and very thick, with short undercoat and rough hair on the head, always with eyebrows and a beard. The color can be completely black, or salt and pepper (black and white hairs, giving a grayish appearance). Spots are not admitted.
A matter of taste in the US, a matter of legal regulation in England and either countries, the Giant Schnauzer with natural dropping ears has its charm, although a more peaceful appearance than its cropped ear brother. 
A highly qualified guardian, the Giant Schnauzer is confident and perfectly apt for defense. As a company animal, it also stands out, since it admires its human friends, although it is cautious with strangers. It has a playful spirit, although it can play quite rough, so children should be closely supervised. Despite its dominant and territorial nature, it has no malice, but works as a thinking work dog with a balanced head.
The average per litter is seven puppies, often more, with a weigh from barely 170 g to more than 500 g per puppy. The tail is docked to the third vertebrae between the second and fourth day. Removing the front dewclaws is optional, but the hind, if any, should be removed, also after two to four days. Ear cropping is optional it is performed between the sixth and twelfth week, according to the litter evolution and breeding practice. Attention to laws in each county regarding this. The Giant Schnauzer has a fast growing period from the 12th week, until several weeks later. The owner should watch the growth, and a prescription diet is recommended, possibly with supplements. There is consistency in poor B12 vitamin absorption. During adolescence there is an emerging of a dominant and guardian instinct,  and these highly appreciated qualities should be properly channeled. The puppy hair will be replaced by the typical hard coat, and stripping will be necessary. The Giant Schnauzer reaches its adult size after around two years.
The puppy should be fed and exercised moderately, which grows quickly. Too much amount and too soon can only have a negative effect in the Giant Schnauzer puppy.
The show Giant Schnauzer is an elegant and athletic dog. A good physical condition and training requires space to exercise for a long legged dog such as the Giant Schnauzer
Although the breed is affected by many diseases and defects, it is mostly controlled by responsible and reduced breeding. Perhaps hip dysplasia and poor character can be the largest concern for the buyer, for which an X ā€“ ray exam and character tests are essential. A Schnauzer can suffer from osteochondritis (a cartilage anomaly that results in limping). There are skin and digestive problem cases, but quite isolated and not hereditary. Eye problems such as retinal dysplasia are reported, although not frequently either. The Schnauzer lives an average of 10 to 12 years. Stomach torsion is a risk in this large breed, so the owner is warned to provide plenty of water at all times, distribute food in smaller portions and limit exercise after eating. Hair care is considerable, with a lot of stripping and some trimming. The amount of exercise needed is also plenty, and early training is essential.
Adopting a guard breed requires more experience and knowledge than a smaller breed with lower risk of harming a third party. Whoever wants a dog for the first time should not attempt it.