Constipation in Cats: When to Worry

Cats are generally more prone to constipation than dogs, in part related to their tendency toward mild dehydration (many cats don't drink as much water as would be ideal, especially on a dry food diet) and in part due to specific conditions more common in cats, like megacolon, a condition where the colon becomes enlarged and loses the ability to contract effectively, making constipation chronic and progressively harder to manage.

Signs include infrequent trips to the litter box, visible straining with little or no stool produced, hard dry stool when it does occur, and sometimes vomiting if the constipation becomes severe enough to cause a backup affecting appetite and stomach comfort. Cats experiencing pain from constipation sometimes vocalize while in the litter box or avoid the box altogether, which owners can mistake for a behavioral or litter box preference issue rather than a medical one.

Mild, occasional constipation that resolves within a day or so is a lower concern. Straining with no result for more than a day, repeated episodes, or any vomiting alongside straining is a different, more serious category, especially since severe constipation in cats can progress to a genuinely difficult-to-treat chronic condition if not addressed.

What to do: For occasional mild constipation, increasing water intake (a water fountain sometimes helps cats drink more), transitioning some dry food to wet, and monitoring is a reasonable first step. Straining without result for more than a day, or any vomiting alongside constipation, warrants a vet visit — earlier intervention generally prevents this from becoming the harder-to-manage chronic pattern.

If straining is present but you're unsure whether it's constipation or something urinary, here's a closer look at that distinction in dogs that also applies conceptually to cats — the key is confirming which system is actually affected.