Do all dogs know when your pregnant?
When a woman is pregnant, the hormones in her body are likely to alter her scent in some way.
So, can dogs sense pregnancy? Because of their keen sense of smell, it's believed by many that a dog can detect a change in a woman even before she does — but it's mostly conjecture.
Many believe it's instinctual behavior, harkening back to the days when your dog's wild ancestors would mask their scent to help them sneak up on their prey.
Wolves, for example, have been observed rolling in animal carcasses or the droppings of plant-eating animals, to cover up their own smell during the hunt.