Every month or once a month an egg will mature within the woman's ovaries. Once it reaches maturity it leaves the ovary and being push down in the fallopian tube where it will be fertilize and may meet up a sperm. This is what we call Ovulation.
The Vet know having shorter ears will not benifit the dog in any way. There are no cons to this, and it will not affect anything but the dog show. But, as long as it will not hurt the dog, the vet will continue.