The Boxer standard in the U.S. states the following about the head:

"The blunt muzzle is 1/3 the length of the head from the occiput to the tip of the nose"
"The top of the muzzle should not slant down(downfaced), nor should it be concave (dishfaced); however, the tip of the nose should lie slightly higher than the root of the muzzle."

When the top of the skull is held level, the tip of the nose is higher than the base.