A dog sleeping amidst lots of stimuli known to excite dogs is exhibiting a lazy, sick or perhaps even unfriendly behavior.

Edit: sleeping is a behavior.

You can say exactly the same thing about a person, which seems to support my point.

I must have misunderstood, upon second read you seem to say something similar to, "nothing is as it appears" no?

Mmm, I think I was going for "lots of things cannot be understood completely by appearance, it is not unique to humans"