Full Grown Giant Schnauzer 2024 Schedule. Estimate the adult weight of your giant schnauzer puppy in 5 simple steps using our free puppy weight chart! The giant schnauzer is the largest of the three schnauzer breeds (the others being the standard schnauzer and the miniature schnauzer).

In general, these dogs will grow to be. This powerful breed hits its maximum size faster than you may think, often rounding out at 18 months.