Because dogs can hear about 100,000 times better than humans and can hear at an ultrasonic range, this means they're likely to be the first to know when it comes to human pregnancy. These samples contain biomarkers for cancer, called volatile organic compounds, which researchers theorize the dogs can smell and identify. In humans and other mammals, apocrine glands secrete pheromones, which can relay a lot of information to dogs. Reaction to pregnancy in some dogs may make them more fearful. “But, dogs, with their strong sense of smell, can detect changes in mom’s smell as she moves through her pregnancy and many dogs are sensitive to changes in appearance or gait.” LaSala, a licensed Family Paws Parent Educator with Rescued by Training , notes changes in routine or updates to a home (like a nursery) can account for odd behavior. Dogs may be able to sense pregnancy through hormonal changes Research has shown that dogs can detect prostate , bladder , and ovarian cancer in humans by sniffing urine samples. A dog’s personality may lead to favorable reactions such as an increase in affection or a development of a deeper sense of needing to protect the pregnant woman. Read on to learn what the experts say. These sudden changes in a dog’s behavior are mainly due to physical changes that the dog can sense within their owner. However, dogs can interpret pregnancy in a different way and might react unfavorably, including behaviors … If only humans had that kind of sense of smell, now that’s a pregnancy test! Subscribe to our weekly newsletter and get the most fascinating dog news from … Looking at it biologically, dogs have a special sensory receptor called the vomeronasal organ, or the Jacobson’s organ. A dog can smell you through a door from 10 yards away, so smelling what’s inside of you probably isn’t all that challenging, even if it’s only in the early stages. First off, dogs’ sense of smell is notoriously sensitive — scientists say they can smell up to 100,000 times better than we humans can. So if pregnancy has you riding the emotional roller coaster, your dog is … A dog might, for example, start following a newly pregnant owner around, or he may be suddenly overprotective. Considering dogs can detect various forms of cancer, bedbugs, diabetes and more, your dog must be able to sense your pregnancy. Dogs may be able to smell the hormonal changes: Firstly, it's possible that, with their heightened senses, dogs can smell the changes in hormones and pheromones that occur in a pregnant woman's body.These hormonal changes can take place as early as within the first month, which means that a dog could sense your pregnancy before you are even aware of it. Imagine the New A&E hit series, “Pregnancy Dogs & The Beverly Hills Wives.” But is it really possible that dogs can sense you’re expecting? Dogs also react to environmental changes that occur at home as a result of pregnancy. Though a dog can't fully grasp the concept of a new member in the family in nine months, they can sense physiological changes far earlier than humans can. Science hasn't weighed in definitively as to whether canines have a sixth sense about human pregnancy. Even when you weren't pregnant, you probably noticed that emotions -- anger, sorrow or elation -- all triggered a reaction in your dog. Even seeing you cleaning or redecorating a room can alter a dog's view of the world.