Lol they say that dogs always know you're pregnant they just don't know how many puppies you're having :p my dog is more cuddly now and sleeps in a ball in front of my belly
My dog did those exact things during my first pregnancy, i dont think they can sense labor but can sense the baby and i guess they are like that to protect the baby.
They Can Deffintly Sense The Hormone Change. ..dogs are very in tune to humans..my dog has been glued to my hip since I've become pregnant.