Pregnancy is already a delicate time for any dog, so when diarrhea occurs, it can cause immediate concern for pet owners.
Digestive upset during this stage may be due to natural changes, but it can also signal more serious issues that require attention.
We outline the common causes of diarrhea in pregnant dogs, what you can do at home, and when to seek veterinary help.
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Dog Diarrhea During Pregnancy — Why It Happens
Diarrhea in pregnant dogs can occur for a variety of reasons, ranging from mild dietary changes to serious health concerns. Hormonal shifts can affect digestion, and increased stress or changes in routine may also play a role.
Parasites, infections, or dietary indiscretions can cause diarrhea at any time, but in pregnancy, dehydration and nutrient loss can be particularly risky for both mother and pups.
Even mild cases deserve close monitoring to ensure the health of the litter.
Common Causes of Diarrhea in Dogs During Pregnancy
Hormonal Changes
Pregnancy hormones can influence the digestive system, sometimes leading to loose stools.
These hormonal fluctuations can also cause changes in appetite, making it harder for your dog to maintain a balanced diet.
While mild diarrhea from hormones may resolve on its own, persistent symptoms require monitoring to avoid dehydration.
Read more: Dog Diarrhea Due to Heat Cycle (Here’s why)
Dietary Changes
Some owners switch to a richer or higher-calorie food during pregnancy, which can trigger diarrhea if the change is made too quickly.
Dogs need gradual dietary transitions to allow the gut to adapt. Sudden shifts in protein or fat content can upset the balance of gut bacteria, leading to loose stools.
Stress and Anxiety
Pregnancy can be stressful, especially if your dog experiences environmental changes, such as a new living space or unfamiliar visitors.
Stress affects the gut-brain axis, sometimes causing diarrhea. A calm, predictable environment helps reduce these risks.
Intestinal Parasites
Worms such as roundworms, hookworms, and whipworms are more dangerous during pregnancy because they can pass to the puppies.
Parasites often cause diarrhea, poor coat condition, and weight loss.
Routine deworming before and during pregnancy (under veterinary guidance) can help prevent complications.
Bacterial or Viral Infections
Infections like parvovirus, salmonella, or E. coli can cause severe diarrhea, sometimes with blood or mucus.
In pregnant dogs, these illnesses can be life-threatening for both mother and pups.
Immediate veterinary care is essential for any sudden, severe, or bloody diarrhea.
Pre-existing Health Conditions
Conditions such as inflammatory bowel disease or pancreatic insufficiency may worsen during pregnancy.
Hormonal and metabolic changes can make it harder to manage chronic illnesses, leading to more frequent digestive upsets.
What to Do If Your Dog Has Diarrhea During Pregnancy
If your pregnant dog has mild diarrhea but is otherwise alert, active, and eating, you can monitor her closely for 12–24 hours while ensuring she stays hydrated.
Offer small, frequent sips of water or an electrolyte solution recommended by your vet.
Feeding a bland diet of boiled chicken and rice for a day or two can help calm the digestive tract.
Avoid over-the-counter medications unless prescribed by your veterinarian, as some drugs can harm unborn puppies.
Keep her environment quiet and stress-free, and make sure she has a comfortable place to rest.
If diarrhea continues beyond 24 hours, worsens, or is accompanied by vomiting, fever, or lethargy, contact your vet immediately.
When to Call or Visit Your Vet
Pregnancy makes even mild diarrhea a potential concern, so don’t delay seeking help if:
Diarrhea is persistent for more than 24 hours.
There is blood, mucus, or a foul odor in the stool.
Your dog becomes lethargic, refuses food, or vomits.
She shows signs of dehydration, such as dry gums or sunken eyes.
She is near her due date and shows signs of distress.
These symptoms may indicate infections, parasites, or other conditions that can threaten both your dog and her litter.
Read more: Dog Diarrhea Due To Stress (Here’s why)
Key Takeaway
Diarrhea during pregnancy in dogs can have many causes, from harmless hormonal changes to dangerous infections.
While mild, short-term cases may resolve with at-home care, it’s safest to be cautious.
Monitor your dog closely, ensure she stays hydrated, and involve your veterinarian promptly if symptoms persist or worsen.
Protecting her health also safeguards the well-being of her puppies.