Enteritis in dogs — symptoms, causes and treatment

11 June 2025

Owners of four-legged pets sometimes face various problems related to animal health. One of the most pressing issues can be enteritis in dogs. Let's figure out what it is!

So, enteritis is an inflammation of the mucous membrane of the small intestine. It usually has an acute course and is accompanied by symptoms of intoxication. This disease can also affect the gastrointestinal tract and heart muscle. It most often occurs in puppies, and it is important to note that, unfortunately, the lack of timely treatment often leads to death.

However, you can be prepared for such challenges in advance by reading this article. It will help you understand how the disease manifests itself, what causes it, and, in fact, how to treat your dog if enteritis is diagnosed.

Causes and characteristics of the disease

The main causative agents of enteritis are viruses — parvovirus and coronavirus. Accordingly, the disease is divided into parvovirus and coronavirus. But there are also mixed types of the disease, for example, when it is caused by both viruses and bacteria, as well as types caused by poor nutrition or bacteria alone.

Parvovirus enteritis is considered the most dangerous of these types, as it rapidly destroys the intestinal mucosa and, in severe cases, penetrates the heart, damaging the myocardium. Its distinctive feature is its rapid spread and severe intoxication even in the early stages.

Coronavirus and rotavirus enteritis are less aggressive, but if left untreated, they can also lead to the death of the animal, especially due to dehydration and exhaustion.

So, enteritis can be presented in the following forms:

Non-viral nature. Infection occurs due to poisoning, poor nutrition, mechanical damage.
Parvovirus. It is aggressive with a mortality rate of up to 85%.
Coronavirus enteritis. This form of the disease initially has vague symptoms, then develops into a classic clinical picture.
Rotavirus. It is similar to the previous one, but the course of this form of the disease is not as hidden.
Gastroenteritis. This form affects the entire gastrointestinal tract with severe intoxication, dehydration, and weight loss.

It can be said that distemper and enteritis are similar diseases. But in order to distinguish between them, you need to know the main differences between such cases, which are:

no purulent discharge from the animal's eyes and no damage to the central nervous system;
no damage to the lungs;
a sharp rise in temperature.

These important differences are characteristic of enteritis because, as mentioned above, it affects the gastrointestinal tract of dogs and can damage the heart. But how exactly does infection occur and what is its source? Understanding these things can help you prevent an undesirable situation.

How does a dog become infected?

It is important to understand that the viruses listed above can survive in the environment for up to 6 months, even on some objects, grass, and in water. Therefore, the main routes of infection are contact with other animals, their biological secretions (e.g., feces, saliva), or transmission of the infection via human clothing. Yes, even that is possible.

The incubation period for enteritis is 2 to 10 days. Not all animals are at risk, but the following are:

puppies under one year old;
unvaccinated dogs;
pets with weak immune systems;
dogs that live in shelters or visit public playgrounds.

It is also interesting to note that there are certain breeds that are most susceptible to the disease. These include Dobermans and, for example, German Shepherds. It has also been noted that males are more likely to contract the disease than females.

Causes of the disease

Every dog owner should know that any dog can become infected. Of course, animals with weakened immune systems are most at risk. Even vaccinated pets can become ill, but fortunately, the inflammatory process is not aggressive and does not pose a risk to the animal's life. So, let's highlight the main factors that can cause infection:

lack of vaccination;
weakened immunity;
the presence of helminthic invasion;
poor or altered diet;
direct contact with infected animals or objects.

Pay attention to the last point, because dogs love to sniff and lick everything! That's why every owner needs to be careful!

Now let's take a look at some of the factors that lead to infection in dogs. First, there is a lack of routine vaccination. When an animal is 2 months old, it can be vaccinated. Then it needs to be revaccinated, first after 10-14 days, and then annually.

The next point is an improper diet for the dog. This includes things like constant changes in your pet's menu, poor-quality food, and food poisoning. These things lead to the development of pathology. The mucous membrane can also be damaged by hot or cold food. But it is important to remember that certain foods also contain harmful additives that are very dangerous!

And the last thing is a decrease in the animal's natural defenses. If the immune system is weakened, viruses can simply develop unhindered in the pet's body. The situation is similar with helminthic invasion. Parasites can severely weaken the immune system of dogs, leading to damage to the gastrointestinal tract and inflammation of the mucous membrane of the digestive tract of animals.

The above factors are conducive to the development of enteritis. Dog owners should stabilize their pet's diet, which is always easy to do by consulting with a veterinarian, strengthen their immune system, and carry out routine vaccinations!

Symptoms of enteritis

During the illness, all food that enters the animal's body is not completely digested because certain disturbances occur in the gastrointestinal tract during this period.

This manifests itself as follows: the dog begins to have diarrhea with mucus, and the feces may contain foam. Then the owner may notice blood in them, which is due to the decay of food inside the intestines. Intoxication occurs, and the pet's body tries to get rid of harmful elements through nausea. You may observe light-colored vomit with mucus, which may later contain blood and bile. All of these are clear signs of the disease, the main symptoms of which are:

diarrhea with mucus or blood;
vomiting with traces of bile, mucus, blood;
refusal to eat, lethargy;
paleness of the mucous membranes;
abdominal pain;
fever, thready pulse.

At the first signs, you need to see a veterinarian! They will provide professional help, but if the owner notices the signs, for example, in the evening when it is impossible to find a veterinarian or call them, you can provide first aid to the animal:

measure the temperature and monitor it all the time;
isolate the dog in a clean, dark room;
provide access to warm boiled water, which can be given simply from a syringe if the animal cannot drink on its own;
clean up feces or vomit to avoid infecting other animals in the house.

And most importantly, do not try any self-medication! Only a specialist can diagnose the disease and prescribe medication or a treatment method. How exactly does he diagnose enteritis? More on that below.

Diagnosis and treatment of the disease

First, the veterinarian must identify the causative agents of the disease and its type. This requires taking a medical history, palpation, and tests. Laboratory tests can confirm the presence of enteritis and rule out other diseases such as hepatitis or distemper.

The doctor conducts blood and stool tests, which are effective in identifying the pathogen. After that, the veterinarian prescribes therapy. The choice of method depends on the condition of the dog, the stage of the disease, its characteristics, and the presence of complications. Accordingly, treatment can be carried out either at home or in a hospital.

The goal of treatment is to achieve a number of objectives:

complete suppression of the virus;
prevention of critical fluid loss;
elimination of diarrhea and nausea;
removal of toxins;
increased resistance of the body's natural defenses;
normalization of gastrointestinal and heart function.

To this end, a number of the following types of drugs are used:

antiviral serums, which block the spread of harmful cells and help strengthen the immune system;
rehydration solutions, which are necessary to prevent complete dehydration and are administered through an IV;
detoxification agents to cleanse the intestines of toxins;
painkillers, which are necessary to help the animal feel better;
hemostatic agents;
agents to support heart function;
antibiotics, which are necessary to suppress viruses and prevent recurrence of the disease;
probiotics to restore the intestinal microflora, which are carefully selected by the doctor.

Sometimes, gastric lavage and diet therapy may be required. The diet consists of light porridge, low-fat broths, and boiled meat without fat. These foods should be given to the dog in small portions and more often than usual — 5-7 times a day.

Diet is a very important part of treatment. For the first few days, you should refrain from feeding your dog, because at this time, severe inflammation in the gastrointestinal tract simply does not allow food to be digested! Therefore, you should definitely not force your dog to eat, as this approach will only exacerbate the symptoms. However, a container of clean water should always be available to the animal, but the water must be boiled!

Then, after about 1-2 days, give your pet liquid foods (the broths listed above, for example, or porridge made with oatmeal or crushed rice). After a week of treatment, you can add lean fish, boneless, and white chicken meat to the diet. All foods must be minced! Feed your dog in small portions, about 5-7 times a day. Remember that foods such as milk, cheese, and fatty meat are strictly prohibited!

Additional measures during treatment

It is important to disinfect the room where the sick dog is located to prevent the infection from recurring and spreading to furniture, floors, dog bowls, and beds. These items should be washed with disinfectants or thrown away (preferably burned, if possible) and replaced with new ones. The rest of the furniture should be treated with antiseptics.

If your pet is being treated at home but there are other animals nearby, it is important to completely isolate the sick animal or, if possible, place it in a shelter or with relatives to prevent infection. Enteritis pathogens can survive in the home for up to 6 months!

So, let's highlight a number of additional — but important — measures when treating a dog at home:

disinfecting the room and belongings;
treating all objects, bowls, and bedding;
temporary isolation from other animals.

If you do everything right, listen to your doctor's advice and recommendations, and follow their instructions, your pet will definitely recover! But sometimes things can go wrong...

Let's figure out in which cases complications may arise.

Possible deterioration and complications

Enteritis can be defeated, but in cases where the pathogens were very aggressive, certain organs of the dog may be severely affected. In such cases, the following complications of the disease may occur:

adhesions between individual tissues in the intestine;

heart failure;
rupture of the small intestine wall;
problems with the passage of food through the gastrointestinal tract;
inflammatory processes in the abdominal cavity;
damage to the heart muscle;
inflammatory reactions in the liver;
problems with female dogs having offspring;
loss of limb mobility;
pancreatitis, peritonitis.

If you do not see a veterinarian in time and allow the disease to develop, the dog may die, and unfortunately, the percentage of such cases is very high!

Vaccination: when, how, and who needs it?

The best solution to prevent the development of enteritis is a special vaccination. Vaccinated animals can become infected with new sources of pathogens, and sometimes a relapse is possible, but in this case, the infection will definitely be of a different form. This is due to the vulnerability of the immune system of dogs, which is normal. But if the pet is vaccinated, the probability of reinfection does not exceed 5 percent. Even if the animal still gets sick again, the disease will be milder, and the owner, already familiar with the symptoms, will accurately recognize them and seek veterinary help as soon as possible.

Puppies are vaccinated according to the following schedule:

1st vaccine — at two months of age;
2 weeks later — second injection;
then — revaccination after one month;
next stage — after teething.

Further vaccinations should be given annually according to the schedule. The veterinarian who will vaccinate your dog will tell you more about this.

But it is important to remember that injections are only given to dogs that do not have any pathologies. Therefore, 10-14 days before vaccination, it is necessary to treat your dog for worms. Vaccination is not given if the animal:

is sick;
is pregnant;
is currently in heat;
is nursing puppies.

After giving birth, vaccination is only given after 3 months.

Before and after such procedures, it is important to maintain quarantine. This excludes contact with other dogs and strangers. This is because the puppy's body is very vulnerable during this period!

Prevention of enteritis

Adhering to the vaccination schedule, maintaining hygiene, avoiding contact with stray dogs, having the animal examined by a veterinarian, and treating it for parasites are important factors in preventing enteritis. These are necessary methods that help avoid a disease that has a tremendous impact on a dog's body. It puts a heavy strain on the animal!

So just make a note of the preventive measures that will protect your pet from infection:

Follow the vaccination schedule.
Do not allow your dog to interact with stray dogs.
Periodically clean your dog's bedding with hygiene products.
Maintain sanitary conditions.
watch for changes in health and behavior;
visit the vet every few months;
treat your dog for worms every 2-3 months.

Love for an animal is shown in things like this — in care, attention, and all the steps you take to help keep your dog healthy!

Frequently asked questions

Can a pet get enteritis after vaccination?

Yes, it is possible, but vaccination helps to avoid specific forms of the disease. Vaccination is a preventive measure that should reduce the risk of infection.