Seeing if that is a good spot.
They're smelling the smells. They're trying to figure out where other animals have been and whether or not another dog or cat has gotten into that area and marked it already.
Dogs sniff each others butts because it is their way of saying hello
dogs enjoy pooping chickens!
they sniff it
No
Just about everything.
dogs
Well if drug dogs are trained to sniff out dip they can but most if the time they are just trained to sniff out drugs.
Move
They use their sensitive noses.
Dogs are similar to humans-they have personalities. So it depends on the dog. But generally; no.
To find out what sex
yes. that pootyhole nice