Small nit-pick - tails are docked, ears are cropped.
Humans sweat through the skin, dogs do not they sweat through the head( panting and such).
Well, sort of. It's not actually sweating, they only sweat through the pads of their feet. Panting removes hot air from the body, and the tongue can swell to 2x its normal size to give more surface area for evaporation.
However the ears have very large veins running through them to help in this process. The ear is typically a large flat area which would help in funneling off heat somewhat like a natural heatsink. When the surface area of the ear is cut down such as in cropping there is not as much cooling ability.
Interesting theory. But what do wild dogs and wolves, with smaller erect ears (and thus, less surface area), do in the heat, then?
If you have the occaision to do it watch a cropped dog and an uncropped dog during a loud noise. The cropped dog will slink back from the noise as if it is uncomfortable to them. The uncropped dog will actually pull the earflap closer down as to protect the inner ear from the noise.
Another interesting theory, and one I'll be sure to be obeservant of in the future, among my own cropped/uncropped dogs as well as those breeds born with erect ears vs. dropped ears. The only time I really purposely observed a loud noise reaction was during training class with my uncropped girl - and she pricked her ears forward as if to say, "WHAT do you think you are doing making all that noise?" The instructor got quite a kick out of it! :D
I have personally witnessed this in different dogs and therefore 100% support the current trend to leave the ears as Mother Nature intended them to be.
LOL - well, if you choose not to crop that is perfectly fine with me, but remember that Mother Nature intended the ears to be erect - dropped/floppy ears are a human invention!