Even though there are many possible causes for nighttime dogs diarrhea, it is essential to be aware of the potential culprits. Diarrhea, however, can occur at any time of the day or night. Although it could indicate more serious health issues, it is usually mild and goes away in a few days.



Causes for Diarrhea in Dogs

Dog diarrhea can be caused by many things, just like humans. Below are the most common causes.

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Stress and Emotional Issues

Dogs can develop digestive problems like diarrhea if they are stressed or emotionally negative. You can help your dog feel safer and less stressed if this is the case.



Some diseases that could cause diarrhea include:

  • Inflammatory Bowel Disease
  • Cancer
  • Colitis
  • Liver Disease
  • Kidney Disease



Bacterial infection

Salmonella is a common bacterial disease in dogs. This can be very dangerous, so ensure to get your dog checked out by a veterinarian immediately.



Several common parasites can cause dog diarrhea. Let’s look at some of the most common.

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Hookworm is a condition in which worms attach to small intestines. Also, Hookworm can also cause diarrhea.

  • Bloody stool
  • Fatigue and weakness
  • Weight loss
  • Low appetite


Hookworms are less common than roundworms. There are two types: roundworms. Also, Toxocara canis is the most severe, while Toxascaris sleonina is the milder.

Roundworm can cause diarrhea and other symptoms such as:

  • Weight loss
  • Low-coated luster
  • Stomach pain
  • Vomiting
  • Fatigue and weakness
  • Distended stomach

Dogs often have roundworms in their vomit and diarrhea. If you suspect your dog has roundworms, take them to the vet immediately so they can be treated.




Coccidia is a single-celled parasite. They can live in your dog’s walls if they are present in their intestines. Coccidia is more common in puppies than in adults. Although it is less common in fully-grown dogs, it can still happen.

You’ll notice extra mucous if the diarrhea is caused by coccidia.

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Food Allergies & Intolerances

Has your dog’s diet changed lately? It could be that they have had diarrhea from something they ate recently. They could be allergic to something or have a food intolerance.

Think about the food your dog ate in the days leading up to diarrhea. Look around and see if there are any foods your dog could have eaten that you didn’t know about. A plant from your garden could be an example.

Diarrhea can occur if your dog has eaten poisonous substances or plants.

Why does my dog have diarrhea in the middle of the night?

Here are some causes of nighttime diarrhea for dogs.


Change in Diet

It is essential to keep your dog’s food habits the same. It is best to transition to a new diet for your dog slowly.

Dog parents should be aware that their pet may experience nighttime vomiting or diarrhea if their diet is changed. Doctors recommend that you start the transition by gradually increasing the amount of the new diet in your pet’s diet each day.

Monitoring your dog during the transition to a new diet is vital.

Consider changing the dog food your puppy was being fed at the shelter. It seems great, but you should give your dog the space to adjust to the new food.



Inflammatory Bowel Disease

IBD is a condition in which the immune system malfunctions causing gastrointestinal tract inflammation. This can cause problems with digestion and absorption of nutrients. This condition can have a devastating effect on your dog’s overall health if it is not treated.

Although veterinarians don’t know the exact cause of IBD and many factors could lead to it, they do know that many factors can cause IBD. It can also indicate other health conditions such as parasite infestation, bacteria infection, or an overactive immune system.

IBD can cause nighttime diarrhea in dogs and bloody stool in cats. You should be aware of this if your dog is suffering from IBDs.


Parasitic Infection

We talked earlier about parasitic infections. One of these could be causing your dog’s sudden nighttime diarrhea.

Parasitic diseases require treatment. Get your dog veterinary care. This will solve the diarrhea problem and make your dog’s companion healthier again.

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Extraintestinal Disorders

Even though issues in the intestinal tract do not usually cause nighttime diarrhea, it can happen. Pancreatitis is a common condition. This is an inflammation of the pancreas that affects digestion and sugar regulation. Dehydration can occur in severe cases due to excess fluid loss.

If there is renal failure or organ dysfunction, toxic substances and waste products that should be excreted can build up in the bloodstream, causing tissue damage.

These could be the causes of nighttime diarrhea for dogs. After all, diarrhea is just a symptom of the body’s attempt to signal deeper problems in the external environment.



How to Stop Dog Nighttime Diarrhea


Stop feeding your dog food.

Depending on age and size, you can fast your dog for between 12 and 24 hours. Older dogs may be able to last longer. This allows your dog’s GI tract to rest and recover. Ensure that your dog gets enough water during fasting.


It is important to make gradual changes in diet.

It would be best if you gradually made any changes to your dog’s food. This will help you notice any issues and avoid severe reactions like diarrhea.

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Make sure your dog isn’t eating things they shouldn’t

Watch your dog closely and make sure he’s supervised by food he shouldn’t eat. Your pet might be chewing on things they shouldn’t.


Peppermint Tea

A good home remedy for nighttime vomiting is giving your dog a peppermint tea dose.

It can treat gastrointestinal issues such as cramps, flatulence, vomiting, and flatulence. It is recommended to consume 25mg of dried herb per pound twice daily.




We now know that dogs can have diarrhea at night for various reasons. Although we cannot prevent all forms of diarrhea, we can reduce the risk by managing dietary habits. A visit to the vet is necessary if your dog experiences diarrhea for more than 3 days. You may need to administer medication or test for food allergies.


I’m a long-time animal lover and owner of two dogs and three cats. I grew up on a farm where we had all sorts of animals, from cows and horses to pigs and chickens. My love for animals led me to pursue a career in writing about them. I have been a pet care writer for over 5 years and have extensive knowledge of animal care, health, and behavior.

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