There was military purpose reseaching re.dogs in USSR, very seriuos science people did it. I read some not secret now article from this reseach and there was statement, that in general tall dogs got better nose, than the small one of the same breed. As I remember this correctly every 4" in shoulders add aprx. 10% of distance to dog nose.
Actually it's physics and nothing else I believe. If your tall dog brings his head low most of the time, it's not about your dog

Geno.