Reiterating real quick.
I personally don't agree with ear cropping, either. Docking, I thought, served a purpose - For dogs who work with livestock and have docked tails, isn't it considered more humane to dock a tail that has a great chance of being crushed or snapped? Or for breeds with "brittle tails", a dog who might just break its own tail sometimes.. ? That is legitimate practice.. isn't it?(not rhetoric, heh)
The only way I would see it as being considerable is if the modification has a function. Without function, it isn't different from aesthetic cropping/docking whatsoever. I see no reason to subject an animal to the stress of anesthesia or pain, however small, just so you might like the look of them a little better. It's nuts.
To me it's slightly comparable to Mom who pierces her toddlers ears. Cool, Mom has her time to dress her daughter and outfit her however she pleases, but I feel like this should be a personal decision for the individual - why not let her wait and see? Even if she "won't remember the pain", it just seems ultimately pointless. And since a dog won't give you its consent, I don't think it should happen.
Not to mention.. anthropomorphization is prevalent enough, why take it to a greater level? It's not as though people don't degrade their dogs enough already.
..just as well, in reference to the picture just below the Hello Kitty tattoo.. if I saw that dog while casually walking, I would probably end up confronting the person attached to its leash. I still can't think of a reason as to why.
...just personal opinion and speculation