Cropping and Docking dogs is somewhat of a controversial practice, if you like me are tuned into the internet activist.
In our modern times, many have come to question the need or advisability of cropping the ears of dogs. In fact, some countries have gone as far as to ban the practice.
The aspect of animal cruelty comes into play in that many people will argue that there is no medical, physical, environmental or cosmetic advantage for the dog to have the pinnas (the ear flaps) surgically altered. And to subject any dog to the "disfiguring" and unnecessary surgical procedure and subsequent taping and bandaging that sometimes needs to be done after the surgery amounts to animal cruelty and is indefensible.
There are others that will argue that for some dogs, the cropped ear will help prevent ear canal infections and make the opportunity for pinna trauma and infection much less likely. They will state that the ear cropping is no different philosophically or ethically than any elective surgery such as spaying and neutering or removing protruding dew claws.