A healthy cat poops once or twice a day, so if your cat hasn’t produced any stool in 48 hours, constipation is the likely explanation. But you don’t have to wait two full days to spot the problem. There are several earlier signs, from what you see in the litter box to changes in your cat’s behavior and energy level, that point to constipation before it becomes serious.
Litter Box Signs to Watch For
The most obvious clue is straining. Your cat gets into position to go but produces little or nothing. You might notice them crouching in the litter box for much longer than usual, tensing their body, or making repeated trips throughout the day without any results. Cats with constipation often feel a persistent sense of urgency, so more frequent visits to the box, not fewer, is actually the pattern to look for.
When stool does appear, pay attention to what it looks like. Constipated cats produce small, hard, dry pellets or crumbly bits that look like wet sand. If you press on the stool with a litter scoop, it won’t leave a mark. It may crack apart into pieces rather than compressing. Normal cat stool holds its shape but is slightly moist and leaves a faint residue when you pick it up. If the stools you’re finding are noticeably drier, smaller, or fewer than your cat’s usual output, that’s a red flag even if they haven’t completely stopped going.
Behavioral and Physical Changes
Beyond the litter box, constipation often shows up as a general change in how your cat acts. A constipated cat may lose interest in food, seem unusually tired, or become less playful. Some cats vocalize while trying to defecate, crying out from discomfort. Vomiting can also occur, especially as constipation worsens and the backed-up stool puts pressure on the digestive system.
You might also notice your cat’s belly feels firmer than usual, or that they flinch or pull away when you touch their midsection. Some cats stop grooming as thoroughly when they’re uncomfortable, so a suddenly scruffy coat in a normally fastidious cat can be a subtle hint.
Constipation vs. Urinary Blockage
This distinction matters because it can be life-threatening. A cat straining in the litter box might be constipated, or they might be unable to urinate, which is a medical emergency. The posture can look nearly identical. To tell the difference, check the litter for any urine output at all. Look for wet spots, blood-tinged urine, or unusual color. A cat with a urinary blockage will often groom their genital area excessively and become increasingly distressed, restless, or vocal over the course of hours.
If you’re unsure whether your cat is straining to poop or to pee, and especially if no urine is being produced, treat it as urgent. Urinary blockages can become fatal within 24 to 48 hours.
What Causes Constipation in Cats
Dehydration is the most common driver. Cats evolved as desert animals and naturally have a low thirst drive, which means they often don’t drink enough, especially if they eat only dry food. Without adequate water, the colon absorbs too much moisture from stool, leaving it hard and difficult to pass.
Certain cats are more prone than others. Older cats, overweight cats, and cats with kidney disease (who tend to be chronically dehydrated) face higher risk. Cats who have been constipated before are also more likely to experience it again. Ingested hair is another common culprit, particularly in long-haired breeds. The hair mixes with stool and creates a firm mass that’s hard to move through the colon.
Stress and environment play a role too. A dirty litter box, a new pet in the household, or a move to a new home can make a cat reluctant to defecate, and the longer stool sits in the colon, the drier and harder it gets. Some medications, including antihistamines, diuretics, and certain pain relievers, can also promote constipation. In rare chronic cases, cats develop a condition called megacolon, where the muscles of the colon lose their ability to contract effectively, leading to repeated severe episodes.
How to Help a Mildly Constipated Cat
If your cat is still eating, not vomiting, and has been constipated for less than two days, a few adjustments at home can often get things moving again.
Start with hydration. Switching from dry food to wet food is one of the most effective changes you can make, since canned food is roughly 75% water. You can also add a splash of water directly to your cat’s food. Some cats drink more from a flowing source, so a pet water fountain is worth trying, though preferences vary. Flavoring water with a small amount of liquid from a can of tuna or low-sodium chicken broth can also encourage drinking. Make sure water bowls are in spots your cat feels safe using, especially in multi-pet homes where one animal might guard the bowl.
A small amount of plain canned pumpkin (not pumpkin pie filling, which contains sugar and spices) adds fiber that can soften stool. One to two teaspoons per day is a safe amount for cats. Powdered psyllium fiber, the same ingredient in products like Metamucil, can also be mixed into food, though it’s best to check with your vet on the right amount for your cat’s size.
Keep the litter box clean. A box that’s scooped daily and fully changed regularly removes one of the most common reasons cats avoid defecating.
What Happens at the Vet
If home measures don’t produce results within a day, or if your cat is vomiting, refusing food, or visibly in pain, a vet visit is the next step. The exam typically starts with feeling your cat’s abdomen. A vet can often detect a hard, stool-filled colon just through gentle palpation. Abdominal X-rays are commonly taken to see how backed up the colon is and to check for contributing problems like a previous pelvic fracture that may have narrowed the pelvic canal, or foreign material your cat might have swallowed.
For moderate cases, the vet may administer fluids under the skin to rehydrate your cat and prescribe a stool softener or a medication that stimulates the colon to contract. For more severe impactions, the cat is sedated and the vet uses warm water or saline infused into the colon while gently breaking up the mass through the abdominal wall. This sounds unpleasant, but cats are asleep for it and typically feel dramatically better afterward. Blood work is usually run as well to check for underlying issues like kidney disease or electrolyte imbalances that could be contributing.
Preventing Repeat Episodes
Cats who’ve been constipated once are at higher risk of it happening again, so prevention matters more than with a first-time episode. Keeping your cat on wet food, maintaining a consistent water supply, and adding a daily fiber supplement are the core strategies. Regular brushing reduces the amount of hair your cat swallows during grooming, which is especially important for long-haired cats.
Weight management helps too, since overweight cats tend to have weaker colonic muscle contractions. If your cat is on any medication that lists constipation as a side effect, ask your vet whether an alternative exists. And for cats who’ve had multiple episodes, your vet may recommend a long-term stool softener or a prescription diet designed to keep things moving consistently.