If your pet is battling diarrhea, you’ll know it. Pets with diarrhea may defecate more frequently than usual, have accidents in the house, and may pass blood, mucus, or even parasites in their feces, which will be softer, looser or more watery than usual.
Most cases of diarrhea resolve in a matter or hours or days without intervention, but if your pet is suffering from loose stools for more than a couple of days, or if he also experiences vomiting, loss of appetite, or lethargy, you should take him to your veterinarian immediately. Small dogs, puppies and kittens with diarrhea are especially susceptible to dehydration, therefore they should be seen by their veterinarian more quickly.
In addition to loose or watery stools, pets with diarrhea may show signs such as:
- Mucus or blood in the stools
- Worms in the stools
- Accidents in the house
- Defecating with increased frequency
- Straining to defecate
As we mentioned above, there are other signs that may indicate a more serious problem. It is worth recapping them here and adding a few to the list:
- Nausea or vomiting
- Fever
- Loss of appetite
- Lethargy (tiredness) or weakness
- Abdominal pain
- Weight loss
Causes
There are many reasons your pet may develop diarrhea. Most commonly, it occurs when he eats something that isn’t part of his normal diet (such as garbage) or when his diet changes abruptly. When switching from one kind of pet food to another, it’s best to make a slow transition over a week, gradually mixing in more of the new food and less of the old food, to allow your pet’s digestive system to adjust, decreasing the likelihood of diarrhea.
Change in Diet
If you have changed the food that you feed your dog, this could cause loose stools. This is especially true if you changed the food suddenly, rather than making a gradual transition from one food to another. This doesn’t necessarily mean that the new food is bad for your dog, but rather that the sudden change has caused an upset in the digestive tract of your pet. It’s best, when switching foods, to first mix some of the new food in with the old and then gradually increase the new food while decreasing the old food. This makes for a smoother transition and can help eliminate the problem.
Moldy Food and Water
Would you eat food or water that has been sitting out for 2 or more days? Probably not, but some pet owners expect their dogs to eat food and drink water that has been out for a week or more. Some molds can grow very quickly and cause diarrhea. You should change your pet’s water at least once a day and food should not be left out for more than a day.
Intestinal Worms/Parasites
Not all worms and parasites cause diarrhea, but there some, such as Giardia, that do. It is caused when they disrupt the lining in the small intestine. Coccidia, which are especially common in puppies, are another parasite that can irritate the intestines and cause diarrhea. The lack of visible worms in the stool does not rule out parasites or intestinal worms as the cause of your pet’s symptoms. Treatment by a vet may be required.
Ingestion of Poisons
Insecticides and other household chemicals can be toxic to your pet. Diarrhea is just one possible effect of your pet ingesting such toxins. If you suspect that this is the cause of your pet’s diarrhea, it’s vital that you get him to a vet or call the pet poison control center right away. Because many household chemicals can be fatal if ingested by your pet, it’s important to keep them out of reach in order to keep your pets safe.
Antibiotics
If your vet has prescribed an antibiotic for your pet, this could be the cause of his diarrhea. Just as some humans experience side effects when taking certain medications, so do pets. If you suspect that your dog is experiencing side effects from a prescribed medication, talk to your vet right away. He may tell you to continue the treatment, or he may prescribe a different medication. Do not discontinue administering the antibiotic without talking to your vet as he may decide that the side effect of having diarrhea is necessary in order to treat the problem for which he prescribed the antibiotic.
Pancreatitis
When a dog has pancreatitis, it causes an inflammation of the pancreatic gland. The disease can be the result of trauma, ingestions of toxins, a virus or other causes. The disease, for which diarrhea is just one symptom, is potentially life-threatening and treatment by a vet is required.
Ingestion of Certain Foods (such as chocolate)
Most pet owners know that dogs should not eat chocolate. In fact, eating the sweet treat that humans enjoy so much can be fatal to dogs. If your dog has ingested chocolate and has diarrhea, it’s a good idea to call your vet. There are other foods that can cause similar symptoms. Chocolate and other harmful or unfamiliar foods are a common cause of diarrhea in pets.
Ingestion of Foreign Objects
Most pet owners have seen their dog munching on grass one minute and vomiting the next. When a dog ingests a foreign matter, be it grass, a strange plant or a stuffed animal, his digestive system may not be pleased. The result can be vomiting and/or diarrhea. It should be clear when this is the cause as the offending object is likely to be visible in the stool or vomit.
Stress
One very common cause of dog diarrhea is stress. If your dog has been boarded, left alone for longer than usual, been to the vet, experienced a move or an addition to the family (either two-legged or four-legged) this can cause stress in your pet. In some dogs, stress can trigger episodes of diarrhea. Usually, the symptoms will go away once the pet is removed from the stressful environment or he grows accustomed to the changes that have taken place around him.
You do not necessarily need to run to the vet because your dog had one or two loose bowel movements. There are times, however, when an immediate trip the vet or pet emergency center is warranted.
Sudden Onset
When diarrhea comes on very suddenly, that alone may mean you need to see a vet. Dehydration is a serious complication, and this is especially true in puppies and in senior dogs. Dehydration has the potential to be fatal, so if the symptoms come on suddenly and are severe, you should get to your local vet or pet emergency center as soon as possible.
Bloody Diarrhea
If you see bloody diarrhea, contact your animal care doctor immediately. Waiting even a day or two could prove fatal to your pet.
Diarrhea Accompanied by Other Symptoms
If your dog has diarrhea but is otherwise acting normal, there may not be cause for alarm. If however, there are other symptoms such as lethargy, complete lack of interest in food or water or if the animal seems to be in pain, you need to contact your vet immediately.
Other possible culprits include:
- Bacterial overgrowth in the digestive tract
- Viruses
- Parasites
- Ingestion of foreign objects, such as toys, bones, and fabric
- Food allergies
- Inflammatory bowel disease
- Antibiotics and other drugs
- Toxins
- Pancreatitis
- Diseases in other organs (such as liver disease)
- Cancer
What To Do At Home
Here are some steps that you can take at home to help your pet start feeling better:
1. Assess your pet. If he seems to be feeling well and isn’t dealing with other symptoms, such as lethargy, poor appetite, or vomiting, and if the diarrhea is an isolated incident, meaning it resolves itself over a period of less than a few hours, you’re likely not dealing with an emergency situation.
2. If your pet’s diarrhea is prolonged, unrelenting, or if it’s accompanied by a significant change in demeanor or the sudden onset of other significant symptoms, you should consider this an emergency. If your pet's stool has bright red blood or you notice very dark or black stools, consider it an emergency. Call ahead and let your veterinary hospital or local ER know you’re on your way.
3. Keep track of the frequency and type of diarrhea (what it looks like), so you can talk to your veterinarian at your next regular visit. If you notice any increase in frequency or worsening of symptoms, however, make an appointment to see your veterinarian to have the condition checked out soon.
4. Feeding a bland diet, skipping a meal (for dogs only), or offering a veterinarian-recommended probiotic preparation might also help — but only for a short time. Call and seek your veterinarian’s advice if the symptoms persist and always before beginning any drug therapy.
What Your Veterinarian Will Do
Your pet’s doctor will follow several basic steps to figure out what’s causing your pet’s loose stools. These may include:
1. History: Your veterinarian will want to know the answers to questions such as: When did you first notice the problem? How has it changed? How has your pet been otherwise?
2. Physical examination: What a pet looks and feels like can tell veterinarians a whole lot about diarrhea. Checking out the entire pet is considered an essential step, even when investigating a seemingly simple case of garbage-eating.
3. Labwork: Your veterinarian may run any of the following basic tests: A CBC (complete blood count), blood chemistry, thyroid hormone test, urinalysis, and fecal examination. For cats, FIV (feline AIDS) and FeLV(feline leukemia) tests may also be recommended.
4. X-rays (radiography): This common imaging study will help examine the intestines and other abdominal organs. Most pets with diarrhea will be specifically evaluated for the presence of gas or abnormal objects in the stomach or intestines, the presence of masses, fluid in the abdominal cavity, and the abnormal size or appearance of organs (like an enlarged liver, for example).
5. Ultrasound: This test uses sound waves to help get a more three-dimensional sense of how things are working in the gastrointestinal system.
6. Gastrointestinal function tests: There are a variety of additional tests that can be conducted to determine the origin of the diarrhea symptoms. In cases of severe or recalcitrant diarrhea, or in cases in which the cause remains elusive, these tests can help accurately pinpoint the cause.
7. Endoscopy/colonoscopy and biopsy (to retrieve a tissue sample): This test is most commonly administered in cases of chronic diarrhea. Anesthesia is required.
Treatment
Definitive treatment of diarrhea depends on the underlying cause. In mild cases, your veterinarian may recommend a bland diet that will be easy for your pet’s body to digest. If your veterinarian finds bacterial overgrowth, your pet may need probiotics or oral antibiotics to restore the normal balance of bacteria in the digestive tract. Medications to firm the stool or treat parasites may be necessary. Diarrhea caused by ingestion of foreign objects may require surgery.
More chronic cases of diarrhea are often treated with special diets and medications. In some cases, the underlying problem may not be completely cured and may need to be managed throughout the pet’s life. Your veterinarian can guide you to the best treatment for your pet.
This has been reviewed by a Veterinarian.