Many images of Great Danes show them with upright (cropped) ears. Many people are unaware that there is a medical procedure required to get the ears to look like this. It is illegal in most countries. The USA is one of the countries where it is still allowed. It is banned in South Africa.
Great Dane ear cropping is a veterinary procedure involving the removal of part or all of the pinnae, or the externally visible flap of the ear, on a dog. During the surgery, the floppy part of the dog’s ear is surgically removed. Afterward, care involves pinning the ears up in efforts of achieving a pointed appearance. (https://greatdanecare.com/great-dane-ear-cropping-101/)