Dog digestive issues 101: Signs and symptoms

Common symptoms of digestive issues

Symptoms that a dog is having trouble properly digesting food can look different from dog to dog, and even from one day to the next.

Some signs are obvious, like vomiting or diarrhea. Others are quieter—changes in appetite, energy, or bathroom habits that can be easy to miss when life is busy. Because the digestive system connects with so many parts of the body, these signs don’t always point to the same underlying cause.

Below are some of the most common ways digestive issues show up, along with examples that can help you notice patterns or changes over time.

Vomiting

Vomiting can look like bringing up partially digested food, white foam, yellow bile, or even just water. It may happen once and pass quickly, or occur multiple times in a short period.

While an occasional single episode may not be alarming, repeated vomiting in one day, blood in the vomit, or vomiting paired with weakness, tiredness, or refusing food are more serious signs that mean you should reach out to your veterinarian right away.

Diarrhea

Diarrhea often shows up as loose, watery, or more frequent stools. Some dogs may have soft or greasy-looking stool, or you might notice mucus mixed in. Sometimes mild diarrhea can resolve quickly, but contact your veterinarian if you’re concerned. Blood in the stool, black or tar-like poop, diarrhea lasting more than a few days, or diarrhea paired with low energy or poor appetite is another clear sign to contact your veterinarian as soon as possible.

Constipation or straining

Constipation may show up as:

• Hard, dry stools;
• Straining to poop; or
• Going several days without a bowel movement.

Some dogs may try to go several times but only pass a small amount (or none at all). If your dog seems to be uncomfortable or in pain, has a swollen tummy, or hasn’t pooped for several days, contact your veterinarian right away.

Appetite changes

Changes in appetite can include skipping meals, eating less than usual, or becoming unusually picky with food. Some dogs may approach their food and then walk away.

For adult dogs who haven’t eaten for about a day—or puppies and small breeds who skip meals—contact your veterinarian for guidance.

Weight loss (or poor weight gain)

Unexplained weight loss may look like:

• More visible ribs
• A narrower waist
• Muscle loss along the back or hips

If your dog is losing weight despite eating normally—or struggling to gain weight during growth—it’s worth a check-in with your vet. Puppies who aren’t growing as expected should be checked out as soon as possible.

Gas, bloating, or stomach noises

Some dogs have more gas, loud stomach gurgling, burping, or a firm-feeling belly. Mild gas can be uncomfortable but doesn’t always point to a larger problem. However, sudden belly swelling, visible pain, restlessness, or attempts to vomit without bringing anything up may be signs of bloat, which is a life-threatening emergency that needs immediate veterinary care.

Nausea

Nausea can be easy to miss. You may notice:

• Drooling
• Frequent lip licking or swallowing
• Eating grass
• Turning away from food

Some dogs seem restless or unable to get comfortable. If nausea lasts for a while or is paired with repeated vomiting, weakness, or noticeable behavior changes, it’s best to contact your veterinarian right away.

Why is my dog having digestive issues?

Digestive issues can show up when a dog’s stomach or intestines aren’t working as smoothly as they should. This can affect how food moves through the body and how well it’s broken down.

When this discomfort lingers, you may notice changes in your dog’s day-to-day rhythm—maybe they’re less playful, not as eager to eat, or just not as connected to their usual routine. These shifts can be easy to miss at first, but they matter.

There are many possible reasons a dog might develop these issues. Understanding the signs and looking at the whole picture can help you start to see what might be going on before you talk with your veterinarian.

7 additional small signs pet parents can often miss

Some digestive problems don’t look like stomach issues at first. You may notice small changes in how your dog acts or gets comfortable, and these shifts can be easy to overlook.

Here are some additional small signs dog owners can miss that can point to digestive discomfort:

• Stretching often, as if trying to get comfortable
• Changing sleeping spots frequently
• Eating, then walking away and coming back later
• Standing still after meals, looking unsure
• Low energy or less interest in play
• Restlessness or trouble settling
• Mood changes or hiding

These smaller shifts can still be important, especially when they last more than a few days. Noticing them can help you and your veterinarian understand what to look at next.

What causes digestive issues in dogs?

Stomach‑ and gut‑related symptoms can come from many different parts of a dog’s body—not just the stomach or intestines.  This is why the same sign—like vomiting, diarrhea, or a change in appetite—can have more than one cause. Understanding the bigger picture can help you notice patterns and share helpful details with your veterinarian.

Here are some of the most common causes for digestive issues in dogs:

• Gastrointestinal (GI) issues: Sometimes your dog’s stomach or intestines are inflamed, irritated, or not working properly. This can cause vomiting, diarrhea, or stomach pain.
• Diet-related problems: Some dogs are sensitive to certain foods or sudden diet changes, either of which can upset their tummies. Food allergies or intolerances can also cause long-term digestive problems.
• Endocrine changes: Hormones help regulate metabolism and many body functions related to digestion. Endocrine disorders like hypothyroidism or Addison’s disease can cause symptoms (like appetite changes, vomiting, or diarrhea) that may affect how a dog eats and processes food.
• Pancreatic issues: The pancreas makes enzymes that help break down food. If it isn’t working well, your dog may not absorb nutrients and can lose weight or have loose stools.
• Infections or parasites: Bacteria, viruses, or intestinal worms can cause diarrhea, vomiting, or other digestive problems.
• Systemic illness: Problems with the liver, kidneys, or other organs can affect digestion and make your dog feel unwell.

Because so many different conditions can cause similar symptoms, it’s important to look at the full picture—your dog’s history, overall health, and any other changes you’ve noticed—to help your vet better understand what might be going on and determine the next best steps.

Conditions commonly linked to digestive issues in dogs

Many different health conditions can lead to digestive issues in dogs. The list below includes some of the specific problems veterinarians often consider when dogs have ongoing or recurring stomach issues.

• Gastritis/gastroenteritis: Irritation of the stomach lining and/or intestines
• Inflammatory bowel disease (IBD): Long-term inflammation in the stomach or intestines
• Colitis: Inflammation of the large intestine (colon)
• Food sensitivities or allergies: When a dog’s body reacts to certain ingredients in their food
• Pancreatitis: inflammation of the pancreas, which helps the body digest food
• Infections: Bacteria, viruses (like parvovirus), or parasites that can irritate the stomach or intestines and cause damage in the gut
• Exocrine pancreatic insufficiency (EPI): When the pancreas doesn’t make enough digestive enzymes to break down food
• Obstruction: Something stuck in the stomach or intestines, often from swallowing non-food objects
• Endocrine (hormone) disorders: Problems with hormone-producing organs like the thyroid or adrenal glands
• Intestinal cancer: Tumors in the gut
• Liver disease: Problems with the liver, which helps process nutrients and filters toxins
• Kidney disease: When the kidneys can’t properly filter waste from the body

There’s a wide range of conditions that can affect digestion, and it’s not always easy to sort through them. What you’re noticing at home—big signs or small ones—helps your vet build the best picture of your dog’s health.

When to call the vet about your dog’s digestive issues

Learning how to differentiate between what's a true emergency and what can be monitored at home can alleviate some of your worry.

If you ever feel unsure, you can always call your vet. You know your pet best, so trust your gut (no pun intended) if you think something might be off with your dog's digestion.

Signs you need to take your dog to the ER:

• Repeated vomiting or diarrhea
• Attempting to vomit but not bringing anything up
• Any blood in their vomit or poop
• Black, tar-like poop
• Severe belly pain or bloating
• Weakness or fainting
• Signs of needing water like dry gums and sunken eyes

If your puppy or small dog is vomiting or has diarrhea, contact your veterinarian promptly, since they may be more prone to rapid dehydration.

Call your regular vet to schedule an appointment within a few days if your dog is still acting normal, but you see:

• Ongoing soft poop
• Occasional vomiting or other digestive issues that keep returning
• Slow weight loss
• Long-term appetite changes

These lists aren’t meant to catch every situation, but they can give you a clearer sense of what rises to the level of an emergency and what can be watched for a short time. They’re here to help you sort through moments that can feel confusing in real time.

What to expect at the veterinary visit

When digestive symptoms keep coming back or are hard to explain, veterinarians often use a few different tests to look for answers. These tests can help show what’s happening inside the stomach, intestines, and other organs involved in breaking down and absorbing food.

Specifically, your veterinarian may recommend several different types of tests to figure out the cause; these tests might include:

• Stool testing: Your veterinarian may ask for a stool (poop) sample to check for parasites or harmful bacteria.
• Blood work: Blood tests can give a broad look at your dog’s overall health and help show whether organs connected to digestion are working as they should.
• Imaging: X‑rays or ultrasound can create pictures of the inside of the body. These help veterinarians look for blockages, swelling, or changes in organs such as the liver or pancreas.
• Specialized tests: Some long‑term or recurring issues may need extra testing, such as pancreatic enzyme tests, food trials, or endoscopy, where a small camera is used to take samples from inside the digestive tract.

These tests help veterinarians see what’s happening beneath the surface, especially when symptoms don’t tell the whole story. Understanding the tools they use can make the next steps in your dog’s care feel a little more straightforward.

Home monitoring: What you can track

When your dog isn’t feeling their best, it can be hard to know which changes matter and which are temporary. Keeping simple notes at home can give you a clearer view of what’s happening over time. You don’t need a detailed log—even quick observations can help you spot patterns that might otherwise blend into a busy day.

Here are a few things many dog owners find helpful to keep track of:

• How often symptoms happen
• What your dog’s poop looks like and how often they go
• Changes in appetite and water intake
• Energy level and overall mood
• Any recent changes to their food or routine 

Keeping track of these details can help your veterinarian see patterns, narrow down possible causes, and decide whether simple adjustments or further testing may be needed.

What to do next

Digestive issues can be frustrating and worrying, especially when the signs are messy or seem to come and go. The fact that you’re paying attention and looking for information already makes a real difference for your dog.

Not every upset stomach points to something serious, but ongoing changes are worth noticing. Watching for patterns in vomiting, diarrhea, appetite, energy, and bathroom habits can help you feel more prepared, whether things settle down on their own or it’s time to get care.

If symptoms are sudden, severe, or match the emergency signs in this article, it’s important to seek urgent help. When changes are milder but lingering or keep returning, talking them through with your veterinary team can help you decide on a plan that feels right for your dog.

In many cases, digestive problems have a cause that can be found and managed. With your attention at home and your veterinarian’s guidance, many dogs go on to feel comfortable again and get back to their usual selves.

Frequently asked questions

Frequently asked questions about this topic