Most dogs have excellent sense of smell and love routine. Therefore, if there is a change in hormones or an adjustment in your schedule or new decorating schemes because you are planning for a baby, your pet might have the ability sense it. animal planet
. A dog's behavior may change completely and could range from a new over-protective attitude to growling at you. An oldie but goodie Daily Mail article hits the nail on the head with this title: "Clingy, needy and moody. It's Rachel who's expecting - but it's her dog who's gone all hormonal."