A constipated dog will repeatedly try to poop without producing anything, or will pass only small, hard, dry pellets. Most healthy dogs have one to two bowel movements per day, so if your dog hasn’t gone in more than 48 hours and is straining when they try, constipation is the likely explanation.
Behavioral Signs to Watch For
The most obvious sign is unproductive straining. Your dog assumes the squat position, holds it longer than usual, and nothing comes out. They may do this repeatedly over the course of a walk or a backyard visit, sometimes squatting five or six times without results. Between attempts, you might notice them circling excessively or scooting their bottom along the ground, which signals discomfort in the rectal area.
In more uncomfortable cases, dogs will cry out or whimper while trying to go. Some constipated dogs have a visibly tense abdomen and will growl or flinch if you press gently on their stomach or lower back. This tenderness means the backed-up stool is causing real pain, not just mild discomfort. You may also notice your dog licking at their rear end more than usual, trying to relieve the irritation.
What the Stool Looks Like
When a constipated dog does manage to pass something, the stool is noticeably different from normal. Expect small, hard, dark pellets rather than the typical soft, log-shaped stool. The pieces often look dry and crumbly. In some cases, you’ll see only a small amount of watery mucus instead of a formed stool. This can be confusing because it looks like diarrhea, but it’s actually liquid seeping around a hard mass that’s stuck further up in the colon. A streak of bright red blood on the surface of a hard stool is also common, caused by straining against the rectal lining.
Whole-Body Symptoms
Constipation that lasts more than a day or two starts affecting your dog’s overall behavior. Decreased appetite is one of the first things you’ll notice. A dog that’s normally food-motivated may walk away from their bowl or eat only a few bites. This happens because the backed-up colon creates a feeling of fullness and nausea. Some dogs will vomit, particularly if the blockage is severe.
Lethargy and general depression are also common. Your dog may seem less interested in play, walks, or interaction. They might lie in unusual positions, shifting frequently to find a comfortable way to rest. Over time, if the problem isn’t resolved, weight loss becomes apparent.
Simple Constipation vs. a Serious Blockage
There’s an important distinction between ordinary constipation and a condition called obstipation, which is essentially constipation so severe that the dog physically cannot move the stool out. In obstipation, a mass of dry, hard feces can extend through the entire length of the colon. Dogs in this state are often visibly ill: lethargic, refusing food, and sometimes vomiting. Their abdomen may feel rigid and distended.
A one-time episode where your dog strains for a day and then passes stool normally is usually not an emergency. But if your dog hasn’t had a bowel movement in two or more days, is vomiting, has a painful or swollen belly, or seems unusually weak, the situation has moved beyond mild constipation. Obstipation won’t resolve on its own and can cause permanent stretching of the colon if left untreated.
Common Causes
Dehydration is the single most common trigger. When a dog doesn’t drink enough water, the colon absorbs more moisture from the stool than it should, leaving it dry and difficult to pass. Dogs should drink roughly 1 ounce of water per pound of body weight each day. A 50-pound dog, for example, needs about 50 ounces (just over 6 cups) daily. Dogs that eat only dry kibble without adequate water access are especially prone.
Low-fiber diets, lack of exercise, and swallowing indigestible objects like hair, bones, or fabric are also frequent culprits. In older male dogs, an enlarged prostate can press against the colon and physically narrow the passage. Previous pelvic fractures can do the same thing. Certain medications, particularly antihistamines and some pain relievers, slow gut motility as a side effect. And some dogs simply become constipated from stress, a change in routine, or reluctance to go in an unfamiliar place.
What You Can Try at Home
For mild, first-time constipation in an otherwise healthy dog, a few simple steps often get things moving within 24 hours.
- Increase water intake. Add water or low-sodium broth to your dog’s kibble. Place extra water bowls around the house. Some dogs drink more readily from a pet fountain.
- Add plain canned pumpkin. Not pumpkin pie filling, which contains sugar and spices, but 100% pure pumpkin. Start with 1 tablespoon per meal for small dogs, up to 4 tablespoons for large dogs. The soluble fiber draws water into the stool and adds bulk that stimulates the colon.
- Get them moving. A long walk or active play session stimulates gut motility. Even 20 to 30 extra minutes of movement can make a meaningful difference.
- Switch to wet food temporarily. Canned dog food has significantly more moisture than kibble and can help rehydrate the digestive tract.
Avoid giving your dog human laxatives, enemas, or mineral oil unless specifically directed by a veterinarian. These can cause dangerous electrolyte imbalances or aspiration if used incorrectly.
What Happens at the Vet
If home measures don’t produce results within a day, or if your dog is showing signs of pain, vomiting, or lethargy, a vet visit is the next step. The exam typically starts with feeling the abdomen and a rectal check, which can reveal hard stool in the colon, an enlarged prostate, or a narrowed pelvic canal from an old injury. Abdominal X-rays are the standard next step, giving a clear picture of how much stool is backed up and whether there’s an underlying structural problem like a healed fracture or mass.
For recurring constipation, bloodwork helps rule out metabolic causes like low thyroid function or dehydration from kidney disease. Treatment depends on severity. Mild cases respond to prescription stool softeners or a high-fiber diet change. More significant impactions may require an enema performed under sedation, or in rare and severe cases, manual removal of the stool. Once the immediate problem is resolved, the focus shifts to preventing it from happening again, usually through dietary adjustments and consistent hydration.