What i mean by big is big compared to most of other dogs like lab and coli and so on. Im not comparing to huge dogs. He is big enough that no one will see it and step forward trespassing or so.
Why euro and not american just because of the size and thicker bones you can say personal preference.
Not that much difference, to be honest. FCI standard for Dobermans (with conversion from metric to inches)
SIZE AND WEIGHT:
Height at the withers: Males: 68 – 72 cm. (26.77 - 28.35 inches)
Females: 63 – 68 cm. (34.8 - 26.77 inches)
Medium size desirable.
Weight: Males: about 40 – 45 kg. (88.18 - 99.21 pounds)
Females: about 32 – 35 kg. (70.55 - 77.16) AKC standard for Dobermans
Size, Proportion, Substance: Height at the withers: Dogs 26 to 28 inches, ideal about 27½ inches; Bitches 24 to 26 inches, ideal about 25½ inches. The height, measured vertically from the ground to the highest point of the withers, equaling the length measured horizontally from the forechest to the rear projection of the upper thigh. Length of head, neck and legs in proportion to length and depth of body. CKC standard for Dobermans
Height at withers—males 26 to 28 inches, ideal 27½ inches (70
cm); females 24 to 26 inches, ideal 25½” (65 cm). Males, decidedly
masculine, without coarseness. Females, decidedly feminine, without
over-refinement. Deviation from ideal height to be penalized in
proportion to the amount of deviation.
And just for the heck of it, since you mentioned them... CKC standard for Labrador retrievers
Size: Ideal height at withers: Dogs 22 ½ - 24 ½ inches (57 - 62 cm);
Bitches 21 ½ - 23 ½ inches (54 -60 cm). Weight commensurate with
height and with the breed’s function as a medium sized, powerful, active
retriever. Approximate weights: Dogs 60-80 lbs (27.27-36.36 kilos);
Bitches 55-75 lbs (25-34.09 kilos). And the CKC standard for Collies
Dogs are from 24-26 inches (60-67 cm) at the shoulder and weigh from
60-75 lb. (27-34 kg). Bitches are from 22-24 inches (55-61 cm) at the
shoulder, weighing from 50-65 lb. (22-30 kg). An undersized or an
oversized Collie is penalized according to the extent to which the dog
appears to be undersized or oversized.