i think it's impossible not to use a higher pitch voice when commanding or reinforcing.. dogs must be able to determine the mood of the command... if it is urgent, or what.
these are all great art works.. a friend of mine who's majoring in art, had his dog dip his tail in paint and n just let him wiggle it in a plain canvas.. it was mixture of different colors.. an abstract piece which then got him a high grade for uniqueness and originality..
I named my english cocker spaniel.. Maxi.. There was this salon downtown where I always get my perm.. Since the hair of my dog is quite curly.. looks like it just got permed.. i named him that.