Dog Behavior answered!

Q: Why does my dog misbehave so often? A: Often what humans view as misbehavior -- excessive barking, counter surfing, jumping on people -- is just normal behavior from the dog's point of view.

Obs: Also if your dog, like mine is a constant window watcher, and sometime seems like there's nothing there but continues to bark anyways. It's annoyning and frustrating but the dog is making sure you know what's going on outside the home, like "Hey, there are some weird people out here! I don't think they're a threat but I just want you to know." They just want to protect the pack.

Q: Why does my dog keep hiding behind her toys and blankets behind the sofa?
A: Despite millennia of domestication, dogs are still wolves at heart. Your dog is just minimizing their exposure during vulnerable hours when they're asleep.

Obs: My dog usually hangs out in the laundry room also known as "the cage". Its where we kept her as a puppy and where she's usually sent for punishment. Some days she'll stay in there most of the day doing as describe as sulking because she'll give you a look like she's guilty of doing something wrong. And she wanted to get ahead of you by punishing herself. But I guess it's like her home and she feels comfortable there.

Q: Why does my dog eat grass even thugh it makes them sick?
A: Sometimes dogs eat grass because their tummies are upset.

Obs: Don't be too alarmed if your dog starts ripping at grass like a cow. Their tummy is upset and most likely all you'll have to worry about is the regurgitated contents of their stomach in a corner somewhere. For the most part that'll be the end of it and things will settle into their normal routine. It's best not to punish your pooch because they didn't really do anything wrong. Just give them a little extra TLC to see them through.

Q: Why does my dog insist on rolling in smelly things?
A: They're hiding their scent as any good predator would. A duck might be alarmed by the scent of 75 pounds of wet dog bearing down on it, but a rotten banana is not on its enemies list. Of course with a dog's heightened sense of smell, all scents are interesting, frightening, exciting, delicious, etc. -- but never disgusting.

Obs: I'm not too certain of this explanation, in fact it's the only one I'm at odds with. Again this is most often a wolf-rooted behavior. My dog in particular used to love scent rolling - rubbing their cheeks or shoulders - in owl scat, which is very pungent in odor. I think dogs are attracted to strong smelling substances and roll them to inhance their own scents.

I also found this in "Wolves: Behavior, Ecology, and Conservation" by L. David Mech and Luigi Boitani:

"Scent Rolling: The tendency of wolves to roll on pungent substances is difficult to explain (reviewed by Reiger 1979). This ritualized behavior involves lowering the head and shoulders onto the substrate, followed by rubbing the chin, cheeks, neck, shoulders, and back on the odorous substance. Natural stimuli for scent rolling, such as rotten carcasses, typically have very strong odors that humans find offensive.

Tests with captive wolves have resulted in extensive lists of potential scent-rolling stimuli, both natural and unnatural (Goodman 1978; Ryon et al. 1986), but they have not conclusively demonstrated the function of this behavior. Possibilities include (1) familiarization with novel odors or changes in odors (Fox 1971a; Ryon et al. 1986), (2) strong attraction or aversion to particular odors (Ryon et al. 1986), (3) concealing one's own scent with something more pungent (Zimen 1981), and (4) making oneself more attractive by applying a novel odor (Fox 1971a). Female African wild dogs roll in the urine of males whose pack they are attempting to join, perhaps to coat themselves with an odor that would be familiar to the pack and to increase the chances of acceptance (Frame et al. 1979)."

Some other little tidbits from the BJ's article:
-Dogs' noses have over 300 million scent receptors -- 50 times more than a human nose -- allowing them to literally "see" their world through scent.

-The average dog can understand about 165 words, but the smartest breeds know upwards of 250 words -- that's on par with a human 3-year-old.

-Dogs' super-sensititve whiskers can sense tornadoes and earthquakes days before they happen.
(source: BJ's Journal - I cut out their product placement! - along with my own observations thrown in)