The Giant Schnauzer is essentially the Standard Schnauzer's ambitions realised at a significantly larger scale. Developed in Bavaria as a driving dog and later as a police and military working animal, they're intelligent, powerful, and deeply committed to having a purpose. At 27–48 kg they're a substantial dog in every sense, and they bring the full Schnauzer combination of intelligence, alertness, and strong opinions about how things should be done.
They're not a dog for passive ownership. Giant Schnauzers need engagement — mental and physical, daily and consistent. They pick up training quickly, which is both their strength and an implicit warning: a dog this intelligent that isn't being properly channelled will channel itself, and the results are rarely what you'd have chosen.
Loyalty to their family is complete and non-transferable. They're not warm to strangers and they're not inclined to be social butterflies. They want to know the people they live with and be unambiguous about the boundary between inside and outside that circle. Early socialisation is essential to prevent this natural wariness from becoming difficult reactivity.
With other animals they can be assertive, particularly with dogs of the same sex. Multi-pet households require careful management. With children in the family they tend to be protective and engaged, though the size and exuberance requires supervision around small children.
The apartment score is low for good reason — these dogs need space and substantial exercise. They're not suited to small living arrangements or sedentary ownership. A yard is strongly recommended; rural or semi-rural living suits them best.
For an owner who wants a capable, loyal, and genuinely impressive working companion and is prepared to invest in the training and exercise commitment the breed requires, the Giant Schnauzer is outstanding. It's not a casual choice, and it shouldn't be made as one.