Most mild cases of dog constipation resolve with simple changes to diet, hydration, and activity. Adding fiber, increasing water intake, and encouraging movement are the first steps to try at home. If your dog hasn’t had a bowel movement in more than two days, or is straining repeatedly with no results, those home remedies may not be enough.
Increase Water Intake First
Dehydration is one of the most common and overlooked causes of constipation in dogs. When a dog isn’t drinking enough, the body pulls water from the colon to compensate, leaving stool dry and hard to pass. Before trying anything else, focus on getting more fluid into your dog.
The easiest method is switching to canned food, which is 70 to 80% water compared to just 9 to 12% in dry kibble. If your dog won’t eat canned food, soak their dry food until it floats, using roughly one cup of water per cup of kibble. You can also add a teaspoon of low-sodium chicken or beef broth to their water bowl to make it more appealing. Some dogs drink more from a pet water fountain than a still bowl. Keep bowls full and refresh them often, since many dogs prefer cool, clean water.
Pumpkin and Other Fiber Sources
Plain canned pumpkin is the go-to home remedy for mild constipation, and for good reason. It’s high in soluble fiber, which absorbs water in the gut and helps stool move through the colon more easily. A few spoonfuls mixed into your dog’s food can make a noticeable difference within a day or two.
The key word is “plain.” You need 100% canned pumpkin with no added sugar, salt, or spices. Pumpkin pie filling is a completely different product and can contain nutmeg or xylitol, both of which are toxic to dogs. Start with a small amount (a teaspoon for small dogs, a tablespoon for larger ones) and adjust based on results. Too much fiber too quickly can cause gas or loose stool.
Other fiber-rich options include cooked sweet potato, green beans, and psyllium husk powder. If your dog deals with constipation regularly, your vet may recommend a high-fiber prescription diet rather than ongoing supplementation.
Exercise and Movement
Physical activity stimulates the muscles that push food and waste through the digestive tract. A dog that spends most of the day lying down is more likely to become constipated than one that gets regular walks. Even 15 to 20 minutes of walking can help get things moving, especially after meals. For older dogs with limited mobility, shorter but more frequent walks throughout the day work well.
Oils as a Lubricant
Small amounts of olive oil or coconut oil can act as a mild lubricant, helping stool slide through the colon more easily. You can drizzle a small amount over your dog’s food. However, more than a tablespoon or two (depending on the dog’s size) raises the risk of pancreatitis and diarrhea. This is a short-term fix, not something to use regularly, and it works best for mild cases where stool is slightly dry rather than severely impacted.
Probiotics for Ongoing Gut Health
Probiotics won’t fix acute constipation the way fiber or extra water will, but they can help keep your dog’s digestive system running smoothly over time. Dog-specific probiotic supplements typically contain bacterial strains naturally found in the canine gut, including Lactobacillus acidophilus, Enterococcus faecium, and Bifidobacterium bifidum. A 2019 study found that dogs given a probiotic blend alongside antibiotics experienced fewer digestive problems, including less diarrhea, vomiting, and appetite loss, compared to dogs that didn’t receive probiotics.
If your dog has recurring constipation, a daily probiotic may help regulate stool consistency. Look for products specifically formulated for dogs rather than human probiotics, since the strains and concentrations differ.
Over-the-Counter Laxatives
Some veterinarians recommend polyethylene glycol 3350 (sold as Miralax) for dogs. It works by pulling water from the body into the intestines, creating a softer, wetter stool that’s easier to pass. It’s typically given twice daily mixed into food and is generally well tolerated, though finding the right dose often takes some trial and error.
This is not something to reach for on your own. Human constipation products, whether laxatives or enemas, should not be used on pets without specific veterinary guidance. Some over-the-counter laxatives contain ingredients that are safe for humans but harmful to dogs. If home remedies like pumpkin, water, and exercise haven’t worked within a day or two, call your vet rather than experimenting with products from the pharmacy aisle.
Prescription Options
For more stubborn cases, veterinarians may prescribe a liquid laxative called lactulose. It’s a synthetic sugar that draws water into the colon and softens stool. It can be given directly by mouth or mixed into food. Your vet will determine the right dose and frequency based on your dog’s weight and the severity of the problem. Lactulose is also used in dogs with liver issues to reduce ammonia levels, so if your dog has liver disease and constipation, your vet may already be familiar with this option.
When Constipation Becomes Dangerous
Ordinary constipation is uncomfortable but not dangerous. Obstipation is. This is when stool becomes so dry and compacted that the dog physically cannot pass it, and the impaction can extend through the entire length of the colon. Left untreated, it can lead to megacolon, a condition where the colon stretches and loses its ability to contract normally.
Watch for these warning signs that signal something more serious than a skipped bowel movement:
- Repeated straining with no stool produced, or only small amounts of liquid
- Vomiting alongside constipation
- Loss of appetite or refusal to eat
- Lethargy or depression, where your dog seems unusually withdrawn or unresponsive
- Visible abdominal discomfort, such as a tense belly, whimpering, or reluctance to be touched
These signs mean the constipation has progressed beyond what home remedies can address. Severe impaction sometimes requires manual removal under sedation or intravenous fluids to rehydrate the colon. The longer you wait, the more difficult and invasive treatment becomes.
Common Causes Worth Addressing
Fixing the immediate problem is important, but preventing the next episode matters just as much. The most frequent causes of constipation in dogs include not drinking enough water, eating a low-fiber diet, lack of exercise, and swallowing indigestible material like hair, bones, or foreign objects. Certain medications can also slow gut motility, as can age-related changes in muscle tone.
Dogs that eat a lot of bones or bone-based chews are particularly prone to constipation because bone material creates chalky, cement-like stool. If your dog gets raw bones or dense dental chews regularly and develops constipation, reducing those treats is often all it takes. Dogs with long coats that groom themselves frequently can also develop constipation from ingested hair, similar to hairballs in cats. Regular brushing helps reduce this risk.