Explained: Why Does My Dog Have Diarrhea at Night?

Nighttime diarrhea for dogs isn’t uncommon. If you have had a pet dog for a while, you probably have seen this happening and likely asked yourself, why does my dog have diarrhea at night?

There are several reasons this might be happening, and though it’s hard to figure out what’s causing diarrhea in your pet dog at night, you can find out some probable cause given that you know the risk factors.

In this guide, we’ll talk about all the possible factors that commonly cause diarrhea in dogs. We’ll also talk about how to avoid the risk factors so you can keep your pet dog safe from night diarrhea as much as possible.

So, Why Does My Puppy Have Diarrhea at Night?

Let’s discuss the major factors that play a reason behind causing your dog to have diarrhea at night.

Food Allergy

Fat and lactose intolerance isn’t so rare in dogs. Like humans, they do get food intolerance and, as a result, get diarrhea. Not all dogs have the same intolerance to the same food. Some breeds have specific food allergies.

What you can do to alleviate this problem in the easiest way is you can talk to your pet breeder about what to feed your dog and what not to. Also, learn about its food habits from other sources. Once you get some idea, you’ll know what not to feed your pet dog.

But there’s a problem here. Suppose your dog is lactose intolerant to a greater degree. You can avoid feeding your pet milk-based items completely to get rid of the problem. But this solution will inevitably bring another problem: calcium deficiency. Without ample calcium supply, your pet will get sick in no time.

So, the above solution isn’t completely practical, and you need a better solution.

One good idea could be to feed the dog a small amount of milk on a regular basis. A small amount won’t be harmful, and even if the dog has a hard time digesting milk, you can give it other milk-based items that cause less lactose intolerance reaction.

By adjusting its diet slowly but regularly, you can get your dog to get used to diet intolerances.

why does my dog have diarrhea at night;

Liver or Kidney Problems

When it comes to aged dogs, kidney and liver issues are very frequent, and you can hardly do much to resolve the problem. Toxic foods play a great role in damaging livers and kidneys, and the less you can feed them to your dog, the better.

You can easily detect a sick dog by its urine color, hunching position, and level of activity. Once you notice the signs, don’t be late to get your dog to the vet.

Foreign Body Consumption

Dogs are curious and will try to get everything inside their mouth, at least everything that fits their mouth. Now, if the object consumed is large enough not to pass through the bowel, it can pose a severe threat to a dog’s health.

If you notice your dog being uncomfortable for some time and having diarrhea, you should check the vet as soon as possible to figure out what’s causing this.

Medicine Side Effects

Some people use stress or pain-relieving medicine for their dogs; doing this can be one of the reasons for diarrhea. Usually, the pain receptors blocking medicines use some sort of chemicals that dogs are allergic to. The chemicals can induce diarrhea in dogs.

sitting dog

Dirty Food

For the most part, dogs are used to eating dirty foods from trash, and there’s no problem with it. But if the food your dog ate out of the garbage has been left out for some time and has grown a moderate level of mold on it, it can be dangerous.

Mold or mildew is toxic, and this reason will be a common answer to “why does my dog have diarrhea at night”? Also toxic are some types of wild mushrooms and other toxic flowers.


All living creatures have some sort of parasite inside their bodies. Having good parasites is important as they help maintain the health of their host. Dogs will have them, like other animals.

But not all parasites are friendly, and since dogs have a habit of eating dirty stuff such as stool, they can easily get affected by outsider parasites getting inside their bodies through the stool.

If somehow parasites get inside the body of your dog, then you can take it to the vet. Your vet will probably take the parasite out or give some medicines, which will kill the parasites inside the intestine.

Change in Major Pellet

If you suddenly change the brand of pellet that you’ve been feeding your dog for some time, it can be one major answer to the question: why does my dog have diarrhea at night?

Don’t make a complete pellet change on a single occasion. Take some time and slowly adjust the pellets. Try adding the new pellet slowly to the old one, and your dog will have an easier time adjusting to the new diet.

Bowel Disease

Inflammatory bowel diseases like irritable bowel disease or IBL are quite common in dogs. This creates an inflammatory sensation in the dog’s intestine and creates reaction with every food that gets inside the stomach. The reasons for this aren’t clear until now.

Bacteria and Virus

Harmful bacteria and viruses from rotten foods or dirty water can cause irritation in a dog’s stomach and cause diarrhea. The prevention for this is to use water from reliable sources and not feed rotten or dirty food to your dog. If you suspect a bacterial or viral attack in your dog, check a vet soon to get medications.

Final Words

You now understand the most common causes that can get your dog to have diarrhea at night. Now you know the answer to the question: “why does my dog have diarrhea at night?”. You’ll now have an easier time figuring out the problems before taking your dog to the vet.

dog health