Could have broken this into two parts at least!
They have heightened sense of smell
I read somewhere that this, referring to dogs, may not actually be true anymore. Our smell may be just as good but focuses on different things. You'd have to check that out though I can't remember where I read it!
Good read!
Really didn't know about the recent findings.
However, if anyone has one defective sense organ, his/hers other sense organs get improved, maybe because they use those organs more. Possibly same thing is happening in dogs.