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While the human brain is dominated by a large visual cortex, the dog brain is dominated by an olfactory cortex.The olfactory bulb in dogs is roughly forty times bigger than the olfactory bulb in humans ...Dogs can discriminate odors at concentrations nearly 100 million times lower than humans can.
Good theory! however i've got a problem with it! I've seen my dog exhibit this behaviour too. Ive also thrown him sticks and seen him walk right over the stick, step on it while looking for it and not so much as glance downwards lol
I've noticed that if you put food near a dog and they do not want it, they seem to actively shift away from it. To explain better as an example, a family members dog was on the back seat of the car. He always sits next to the open window and most of the time has his head stuck out. I was eating pizza and put the crust in front of him on the back seat. He sniffed it and then moved to the other side of the back seat. I've NEVER seen him sit on the opposite side to an open window so it seemed pretty clearly to be due to the pizza crust. I've noticed other dogs do this before too. I was mulling over the purpose of this behaviour, any ideas?