Cat Constipation

Seeing your cat strain in the litter box or pass little to no stool can be worrying. Because cats often hide illness, constipation can be easy to miss at first, so it is worth paying attention to early signs and knowing when to call a veterinarian.

Talk to a vet

When to call a vet

Emergency

Go to the ER now

● Your cat is repeatedly straining in the litter box and producing no stool, especially if you are not sure whether they may actually be trying to urinate.
● Constipation is accompanied by repeated vomiting, severe lethargy, collapse, or marked weakness.
● Your cat has a painful, swollen, or tense abdomen, cries when handled, or seems distressed.
● You suspect your cat may have swallowed a foreign object, bones, litter, string, or another indigestible material.
● Your cat has not passed stool for more than 48 hours and now seems unwell, dehydrated, or unwilling to eat.

Urgent

See a vet within 24 hours

● Your cat is straining to defecate, passing only small hard stools, or going into the litter box more often than usual.
● You notice reduced appetite, hiding, irritability, or less activity along with constipation.
● There is blood or mucus on the stool or around the anus.
● Constipation keeps coming back, or your cat has a history of megacolon or chronic constipation.
● Your cat is an older cat, has kidney disease or arthritis, or seems painful when trying to posture in the litter box.

Monitor

Watch at home, call if it worsens

● Your cat is otherwise bright and comfortable but passes a slightly dry or hard stool once.
● There has been a mild recent change in stool frequency, but your cat is still eating, drinking, and acting normally.
● You suspect a minor hydration or routine issue, and your cat is still passing some stool without obvious pain.
● You can monitor litter box output closely over the next 24 hours and your cat has no vomiting, abdominal pain, or lethargy.

Common Causes of Cat Constipation

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Dehydration

When a cat is dehydrated, the colon pulls more water from stool, making it dry and hard to pass. This is a common contributor, especially in cats that do not drink well or have underlying illness.

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Pain or mobility problems

Arthritis, pelvic injuries, or pain can make it hard for a cat to posture normally in the litter box. Cats may avoid defecating because it hurts, which can worsen constipation.

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Idiopathic constipation or megacolon

In many cats, no single cause is identified. Some develop poor colonic motility over time, and severe or repeated constipation can progress to megacolon.

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Hair, foreign material, or obstruction

Hair, bones, litter, or other poorly digestible material can become mixed with stool and make it difficult to pass. In some cases, an obstruction or narrowing of the colon is involved.

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Underlying disease

Constipation can be linked to problems such as kidney disease, metabolic disorders, or neurologic disease. Cats often hide these illnesses, so constipation may be one of the first visible signs.

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Medication or diet factors

Some medications and low-moisture diets may contribute to constipation in certain cats. Diet changes, fiber strategies, or stool softeners should be guided by your veterinarian.

What to Do at Home

If your cat seems mildly constipated but is otherwise comfortable, focus on observation and supportive care while arranging veterinary advice if the problem does not quickly improve. Do not give human laxatives, enemas, oils, or home remedies unless your veterinarian specifically tells you to. Because cats can look stoic even when they feel unwell, any ongoing constipation deserves attention.

Monitor the litter box closely so you know whether your cat is passing stool, how often, and whether they are straining.
Encourage water intake with fresh water, additional bowls, a fountain, or canned food if your cat already eats it safely.
Keep the litter box easy to access, clean, and low-sided if your cat is older or has arthritis.
Watch for red flags such as vomiting, hiding, loss of appetite, abdominal pain, or repeated trips to the box with little output.
Call your vet promptly if constipation lasts more than a day or two, keeps coming back, or your cat seems uncomfortable.
If you are not sure whether your cat is constipated or blocked from urinating, treat it as urgent and call a vet right away.

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Frequently asked questions

How can I tell if my cat is constipated?

Common signs include straining in the litter box, passing small hard stools, defecating less often, crying or seeming painful when trying to pass stool, and reduced appetite or activity. Because cats often hide illness, even subtle litter box changes are worth noticing.

Is cat constipation an emergency?

Sometimes. It is an emergency if your cat is repeatedly straining and producing nothing, especially if you are unsure whether they are trying to urinate instead of defecate. It is also urgent to emergency if constipation comes with vomiting, lethargy, a swollen or painful abdomen, or suspected foreign-body ingestion.

What causes constipation in cats?

Causes include dehydration, pain or arthritis that makes litter box posture difficult, foreign material such as hair or indigestible matter, medications, and underlying diseases such as kidney or neurologic problems. In many cats, no specific cause is identified, and some develop chronic constipation or megacolon.

Can I give my cat something at home for constipation?

Do not give human laxatives, enemas, oils, or other remedies unless your veterinarian advises you to. The safest home steps are monitoring stool output, encouraging hydration, keeping the litter box easy to use, and calling your vet if the problem is not clearly mild and brief.

How long can a cat go without pooping before I should worry?

If your cat has not passed stool for more than 48 hours, or sooner if they are straining, vomiting, hiding, or not eating, call your veterinarian. Ongoing constipation can become more painful and harder to treat the longer it continues.

Sources

Disclaimer: The information provided in this article is for educational purposes only and does not constitute veterinary medical advice. Reading this content does not establish a veterinarian-client-patient relationship. Every pet is different — always consult a licensed veterinarian before making decisions about your pet's health, diet, or care. If you'd like personalized guidance, you can talk to one of our vets. If your pet is experiencing a medical emergency, contact your local emergency animal hospital immediately.

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