Measure standing, from the tip of the nose to where the tail starts, not the tail tip.
How do they sleep?
Bed length at least
80 cm
Bed width at least
54 cm
Size band
Medium
Rule of thumb: dog length plus 5 cm (curled), 10 cm (side) or 15 cm (sprawled), and width about 70% of the dog's length plus 5 cm. This is a common shop rule, not a vet standard, so use it as a starting point and check your dog can stretch out.