Posted by Pet Honesty on

How to Deal with Puppy Diarrhea – Causes and Treatment

Table of Contents

Diarrhea is a common health issue that affects puppies, just like it does for humans. If your puppy experiences diarrhea, it's not his or her fault and certainly isn’t done on purpose.

Because puppies are new to the world and still learning, always approach these situations with love and patience. Chances are they probably aren't feeling too good themselves and are relying on you for your help.

In this guide, we will discuss the causes of puppy diarrhea and how to treat it so that your puppy can feel loved and in their best health.

Types of Puppy Diarrhea

Puppy diarrhea is a common problem that many dog owners face.

Depending on the cause, there are different types of puppy diarrhea that your furry friend may experience:

Acute Diarrhea

Acute diarrhea refers to sudden onset and short duration of diarrhea, usually lasting a few days. It is commonly caused by bacterial or viral infections, changes in diet, or ingestion of something toxic. Acute diarrhea can also be a sign of stress, especially in young puppies.

Chronic Diarrhea

Chronic diarrhea is characterized by persistent and long-lasting episodes of diarrhea that may last for weeks or even months. This type of diarrhea can be caused by several underlying conditions, such as food allergies, inflammatory bowel disease, or parasites.

Symptoms and Signs

Diarrhea in puppies is typically accompanied by other symptoms that can give you an idea about the severity and potential cause of the problem.

Some common signs to watch out for include:

  • Loose or watery stool with a foul odor
  • Increased frequency of bowel movements
  • Straining or urgency to defecate
  • Blood or mucus in the stool
  • Loss of appetite
  • Lethargy and weakness

If your puppy has diarrhea or shows any of these symptoms, it is important to monitor them closely and seek veterinary care if necessary.


Why Does My Puppy Have Diarrhea?

Viral Infections

Puppies are particularly susceptible to viral infections, such as parvovirus and distemper, which can cause severe diarrhea and other gastrointestinal symptoms. These viruses are highly contagious and can be fatal if left untreated.

Canine Parvovirus

Parvovirus is a highly contagious and life-threatening viral infection that mainly affects young puppies. It spreads through direct contact with infected feces or contaminated objects, such as food bowls, toys, or bedding. Symptoms of parvovirus include severe diarrhea, vomiting, loss of appetite, and dehydration.


Distemper is another common viral infection that can cause diarrhea in puppies. It is spread through respiratory secretions and affects multiple body systems, including the digestive and gastrointestinal tract. In addition to diarrhea, distemper can also cause fever, coughing, nasal discharge, and neurological symptoms.

Viral or Bacterial Infections

Bacterial infections, such as salmonella and campylobacter, can also cause diarrhea in puppies. These bacteria are often found in contaminated food or water and can lead to severe gastrointestinal symptoms, including diarrhea.


Salmonella is a type of bacteria that can cause diarrhea in puppies, especially if they ingest contaminated food or water. This bacterial infection typically causes acute diarrhea and may also lead to vomiting, decreased appetite, and fever.


Campylobacter is another common bacterial infection that can cause diarrhea in puppies. It is usually spread through fecal-oral transmission, and symptoms may include watery or bloody diarrhea, abdominal pain, and fever.


Puppies can also develop diarrhea due to various parasitic infections.

Some common parasites that can cause diarrhea in puppies include:


Roundworms are intestinal worms that are commonly found in puppies. They can be transmitted through the mother's milk or by ingesting the eggs from contaminated soil or feces. Infected puppies may experience diarrhea, vomiting, pot-bellied appearance, and poor growth.


Giardia is a protozoan parasite that can cause intermittent diarrhea in puppies and adult dogs. It is transmitted through contaminated water sources and can also infect humans. Symptoms of giardiasis include foul-smelling diarrhea, weight loss, and lethargy.

Dietary Changes

Puppies have sensitive digestive and immune systems, so any sudden changes in their diet can lead to diarrhea. It is important to monitor your puppy's stool when changing their diet and consult with a veterinarian for guidance.

The biggest culprits when it comes to dietary changes are: 

New Foods

Puppies have delicate stomachs and may not tolerate new food, especially those that are rich or fatty. It is important to introduce new foods slowly to avoid any digestive issues.


Allergies to Certain Ingredients

Some puppies may have allergies or sensitivities to certain ingredients in their food, leading to diarrhea. Common allergens include wheat, corn, and dairy products. If you suspect your puppy has a food allergy, consult with a veterinarian for proper testing and dietary recommendations.


Nobody likes stress, and if your puppy is quickly thrown into new and stressful situations, their nervous system may not be able to handle it, manifesting in physical symptoms such as diarrhea.

Events that can cause severe stress for new puppies are:


Moving to a new home can be stressful for puppies, and this stress may manifest as diarrhea. To ease the transition, try to maintain your puppy's routine as much as possible and provide them with a comfortable and safe space.

Separation Anxiety

Puppies who are separated from their mother too early or spend extended periods alone may experience separation anxiety, which can lead to diarrhea. It is important to provide your young puppy with socialization, training, and plenty of attention to help them feel secure.


Traveling can also cause stress and lead to diarrhea in puppies. To make traveling less stressful for your puppy, ensure they have a comfortable and familiar space, provide them with regular potty breaks, and speak with your veterinarian about any necessary medications.

Changes in Routine

Puppies thrive on routine, so any sudden changes to their daily schedule can cause stress and digestive upset. Try to maintain a consistent routine for your puppy as much as possible to avoid unnecessary stress.

Medication Side Effects


Antibiotics are commonly used to treat bacterial infections, but they can also cause diarrhea as a side effect. This is because antibiotics not only kill harmful bacteria but also beneficial ones in the gut. If your puppy experiences diarrhea while on antibiotics, speak with your veterinarian about potential probiotic supplementation.

Parasite Medications

Medications used to treat parasitic infections can also cause diarrhea as a side effect. This is because they are designed to kill the parasites, but may also affect the healthy bacteria in the gut. If your puppy experiences diarrhea while on parasite medication, speak with your veterinarian about potential probiotic supplementation.

How Can I Treat My Puppy's Diarrhea?

The treatment of puppy diarrhea will depend on the underlying cause. In some cases, diarrhea may resolve on its own with supportive care. However, if diarrhea persists or is accompanied by other concerning symptoms, it is important to consult with a veterinarian for proper diagnosis and treatment.


Home Care

If your puppy has mild diarrhea without any other concerning symptoms, you can provide supportive care at home.

This may include:

  • Withholding food for 24 hours to allow the gut to rest
  • Providing a bland diet of boiled chicken and rice to help firm up stools
  • Ensuring your puppy has access to plenty of clean water to prevent dehydration
  • Monitoring their stool and overall behavior closely

If symptoms persist or worsen, it is important to consult with a veterinarian immediately.


In some cases, medications may be prescribed to help treat underlying causes of puppy diarrhea.

These may include:

  • Antibiotics for bacterial infections
  • Anti-parasitic medications for parasitic infections
  • Probiotics to replenish beneficial bacteria in the gut

Always follow your veterinarian's instructions and finish the full course of medication as directed.


In addition to medications, your veterinarian may also recommend supplements to help support your puppy's digestive health.

These may include:

  • Probiotics to replenish beneficial bacteria in the gut
  • Prebiotics to promote the growth of beneficial bacteria
  • Digestive enzymes to aid in digestion and nutrient absorption
  • Multivitamins to help build your dog's immune system and ensure they’re strong enough to face whatever bacteria they come in contact with

It is important to consult with a veterinarian before starting any supplements for your puppy.

How Can I Prevent Puppy Diarrhea?

Preventing puppy diarrhea is all about keeping your furry friend healthy and happy.

This includes:

  • Feeding a balanced and high-quality diet appropriate for your puppy's age and size
  • Avoiding sudden changes in diet or introducing new foods without proper transition
  • Providing regular exercise and mental stimulation to reduce stress
  • Keeping your home and puppy's living area clean to prevent exposure to harmful bacteria or parasites
  • Maintaining a consistent routine for your puppy
  • Following your veterinarian's recommended vaccination and deworming schedules
  • Unvaccinated dogs are at a higher risk of intestinal parasites, especially young puppies

By taking preventative measures, you can help keep your puppy healthy and avoid the discomfort of diarrhea. However, if your puppy does experience diarrhea, it is important to address it promptly and consult with a veterinarian if necessary.

All in all, with proper care and treatment, your puppy's digestive system will be back to their happy and healthy self in no time!

Got any more puppy questions? Why not ask the experts at Pet Honesty? For every question, we got an answer.