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How dogs react to human pregnancy can vary from dog to dog, and can come as a complete surprise. All dogs can pick up on the changes and tell that something is changing, even if they don't understand that it is because of a baby. Many dogs won't change or have a surprising reaction, but it is possible that your dog's behavior during pregnancy can change significantly… for good or for bad.
Kelley, dog trainer
“ I’ve even lost my awkward discomfort about directly asking clients stating “sudden behavior changes in their dogs” if they know or might be pregnant. One was on fertility treatment, another was trying, and a third....was surprised.”
The short answer is: Yes! Dogs can sense pregnancy through their powerful sense of smell (detecting hormonal changes), by observing behavioral and physical changes in you, and by noticing disruptions to their routine.
According to a 2025 study published in Anthrozoös by Wilson et al., nearly two-thirds of dog owners noticed behavior changes in their dogs during pregnancy, with over a quarter reporting that changes began before they even knew they were pregnant themselves!
Colleen
“My female dog was the one who convinced me to take a test. She is totally attached to my husband. But instead of going to him when he sat on the couch with lunch, she was like a statue sitting behind me while I worked at my desk. He even called to her for a treat with no response. Tested that night with a strong positive.”
A dog's nose has up to 300 million receptors (humans have about 6 million). They can detect parts per trillion. While a home pregnancy test needs a certain concentration of hCG in your urine to turn positive, a dog might smell the very first chemical shifts in your breath or skin oils days before the test catches up.
Dogs are "expert observers" of your routine. They notice you’re moving a little slower, sleeping more, or even just acting slightly different due to the very early progesterone rise that follows ovulation.
Some dogs are highly sensitive to these changes and react immediately, while others may not show any behavioral shift until later in pregnancy - or at all.
Luna's mom
“Our greyhound didn’t show any change until the third trimester. She became really gentle with me, very gently offering me her paw, asking for pets and cuddles. Before the third trimester, she would shove her paw into my tummy and push until she got attention. She even started walking really slowly next to me on walks instead of haring off and being a nutter.”
Dog behavior during pregnancy can also change with each pregnancy.
Alex
“I had prenatal anxiety with my second, so I’m not sure whether my pup knew I was pregnant, but she knew I was anxious. She became reactive and very protective. It was exhausting. I wish I could go back in time and fully understand how my anxiety affected her. She was fine with my third pregnancy because I had no anxiety issues. So hard when every pregnancy and postpartum time is different.”
Every dog reacts differently to pregnancy. Here are the most common behavior changes we see - from extra cuddles to unexpected aggression. Your dog might show one, several, or none of these behaviors.
When it comes to dog behavior during pregnancy, one common reaction is a dog becoming extra lovey and needy.
Moms have shared how their dogs would look for their "approval" before doing everyday things throughout the day.
Lexi
“My dog started sleeping next to me instead of my husband. She would follow me everywhere, even to stand guard of the bathroom at night.”
Your dog might also stop jumping on you, become much more gentle, and may not stray as far from you as they did before.
Other behaviors you might see with these ultra-loving behaviors are dogs pushing people away from your belly or the oh-so-cute way they will rest their head on your bump. Your dog might start licking and nuzzling into your belly and legs or spend a lot of time smelling your face, crotch, or belly.
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Kristina
“My dog was always attached to me, but the pregnancy brought it to the extreme. He also listens a lot more to me than to my hubby. 21 weeks now, and he's starting to rub his head on my belly and pushes people away from it. He won't bark, but if my mom touches my belly or his dog friends go to smell me, he stands in between us.”
What to do: If your dog is extra clingy, practice brief separations throughout the day to help them build independence before the baby arrives. Set your dog up for success: go for a walk first, play, or do some training. Once your dog is tired, offer them a chew or a puzzle toy, and take a nap. Close the office door. Spend some time in the nursery. Take a shower. The Dog Meets Baby Preparation Course includes a module on gentle separation training before your baby arrives and many simple exercises throughout the course.ut the course.
Unfortunately, not all dogs will become extra-loving during pregnancy. Instead, your dog may start showing a different side you aren't used to.
Some dogs develop separation anxiety or seem to move backward in their training by eating things, destroying the house, or peeing and pooping in the house. Other dogs can show a more aggressive side, especially while on walks or around strangers.
Addison
“My girl has become reactive on leash. She will randomly lunge at probably 1 out of every 10 people with no discernible pattern, other than we’ve noticed that she doesn’t like when people move quickly around me. It’s giving me so much anxiety.”
They may growl at your partner or protect your house or space.
Frankie
“Our dogs' behavior is all over the place: new reactivity to other dogs, sometimes extra sweet, but more growly and snappy (sometimes scary) with my spouse. It’s been hard.”
And lastly, there are some dogs who will become distant and less engaging. Some dogs may lose their appetite or start to hide in a different room.
Caroline
“My dog seemed very freaked out by me when I first became pregnant - would stay away from me and stare at me suspiciously from afar.”
What to do: If your dog is showing reactive or aggressive behavior, it's important to address this NOW, before the baby arrives. You don’t always need complex training; sometimes, management is all you need.
Example: If your dog is only reactive when they are on walks with you, consider having someone else walk your dog, or walk them in places or at times when the triggers are less frequent or not present.
If the aggressive behavior or reactivity can’t be easily managed, work with a professional trainer who specializes in these issues. Use this time to double down on the pre-baby preparations and training for your dog.
Here are OTC products that can take the edge off but always consult your veterinarian before ordering. If your dog's anxiety is severe, your dog stops eating, or hides all the time, don’t wait, talk to your dog’s veterinarian.
If your dog seems wary or anxious around you, don’t take it personally. Most importantly: don’t force your dog to stay near you. Respecting their need for space is the first step in rebuilding trust. Instead, look for low-pressure ways to reconnect. See if going on walks together, playing your dog’s favorite game, or short training sessions with yummy treats can help reinstate your bond. Let them rediscover that you are still their safe person, even as everything else is changing.
As mentioned above, dog behavior during pregnancy will not always change.
Debbie
My dog hasn't changed at all. She's still her normal self. I was totally expecting a change!
My dog Lola definitely "knew"; she was sniffing me much more, but her behavior remained the same. I secretly hoped she would be more cuddly, but it didn't happen.
Important reminder: Even if your dog shows no reaction during pregnancy, they still need preparation for the baby's arrival. The biggest changes for your dog will happen after the baby comes home, not during pregnancy.
Many parents shared that their dog’s behavior returned to how it was before the baby arrived.
CK
“My pup became way more reactive on walks. Now that baby is here, he’s back to his old carefree self, which I appreciate as I simultaneously navigate a stroller and his leash.”
But it’s not always the case.
If your dog is only reactive towards other dogs or people when with you, if doable, have your dog stay somewhere else when you have houseguests. Keep your dog separated when people come over, especially if it’s just a one-time visitor, or let someone else walk the dog in places where there are dogs and people. While some dogs go "back to normal," some remain reactive.
Heather
“My dog is much more reactive on leash now. It started during pregnancy, and the baby is 1 month old now. He will bark and bark at any other dog we pass on a walk.”
Some dogs become protective of the pregnant mom, and once the baby is born, they are protective of the baby.
Angela
“My dog didn’t like new dogs near me on walks when I was pregnant, and since having the baby, she doesn’t want new dogs near my baby either.”
The key is not to wait and see which category your dog falls into. Address concerning behaviors during pregnancy so you're not handling a reactive dog while also caring for a newborn.
If your dog is barky in general, and since you got pregnant, the barking is out of control, there is a lot you can do to reduce the amount of barking. Barking is always worth addressing because, while most infants sleep through the barking, many new parents find barking extremely annoying. Sensory overload is real, and something I personally struggled with a lot. Here are some ideas:
Whether your dog has a behavior change or not, preparing them for the baby is always beneficial.
If you're wondering what really matters, what you can skip, how to make sure you're doing enough without going overboard, AND you want to have a place where you can ask a real human expert questions and have a supportive community, check out our Pre-Baby Courses.
The Preparation Course walks you through exactly how to prepare your dog before baby arrives.
If you are anxious about how your dog is going to react to your newborn, the First Meeting Course gives you a step-by-step plan for introducing your dog to your newborn.
For comprehensive preparation, we recommend our most popular Pre-Baby Course Bundle, which includes both the Preparation Course and the Pre-Baby Course. See what real parents say about our courses HERE.
If you need more personalized support, Dominika offers:
While you're working on training, don't forget about setting up your physical space! Our Baby Registry Guide for Dog Parents takes the guesswork out of choosing baby gear when you have a dog - from the most effective baby gates to nursery setups that keep both baby safe and dog comfortable.
Check out our discount codes to get discounts from many of our favorite trusted brands.
The bottom line: No matter how your dog is reacting to your pregnancy, the most important thing is to prepare them before the baby arrives. You’ve got this!
Disclaimer: This blog is for educational purposes only. Please contact your veterinarian, a certified dog trainer, or a veterinary behaviorist if your dog's well-being is at risk or your dog's behavior poses a threat to you or other people.
Online resources to help your baby and dog get along—right from the start and as they grow up together.
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