Dogs have different ideas about social behavior and hierarchy and
trying to force them to live in a way that humans like to live is a
serious disservice to the animal.

True, but that's not why "it's only a dog" is objectionalbe. It's
because the emphasis is not on "dog" but on "only".

People who put clothes on their dogs
require psychological help.

Agreed. But that's not what it's about either.

Jose
--
There are two kinds of people in the world. Those that just want to
know what button to push, and those that want to know what happens when
they push the button.
for Email, make the obvious change in the address.