Best Fiber Supplements for Cats of 2026

Two ingredients, both of them food: drum-dried pumpkin and apple pectin. For a cat whose stool has gone soft after a food change or a course of antibiotics, that's often all you need — both are fiber sources that hold water in the gut and give stool something to bulk around. There's no psyllium, no slippery elm, and no flavoring, which makes this the easiest of these picks to hide in a bowl.

It's labeled for cats and dogs, and the ingredient list doesn't change between them; what changes is the amount. So find the cat line rather than eyeballing a scoop sized for a Labrador. The other thing to be clear about is the job: this is a stool product. It firms things up and settles a grumpy gut. It does nothing for hairballs, and if that's your problem, a psyllium formula is the better tool.

Where it earns its place is the week after a food transition, when stool goes soft and you want something plain and predictable to stir in rather than another flavored chew. Four ounces is a lot of doses at cat size, and the pouch reseals and sits in the cupboard without going stale. It's the one here we keep on the shelf for a specific problem rather than for every day.

Tear a pouch and you get pumpkin and water, nothing else — grain-free, unsweetened, and portioned so there's no half-can of pumpkin wrapped in foil at the back of the fridge. If your cat already eats wet food, that pouch disappears into a meal without any new ritual: no scoop, no pill, no powder to mix.

Texture is where it divides. This puree runs thinner than the canned pumpkin people compare it to, closer to a slurry than a spoonable mash, and cats split on it exactly as you'd expect — the ones that like pumpkin lap it up, the ones that don't will walk away from a bowl with a spoonful stirred through. It's also shelved as food rather than as a supplement, which is honest about what it is: a fiber-rich topper, not a measured dose. For a cat with an occasional off week, we think that's plenty; for a real problem, you want something you can count.

A case of twelve goes further than it sounds, since one pouch is more than a single serving for a cat, and a half-used pouch holds in the fridge for a day or two. That's the trade for the convenience: you're decanting pumpkin rather than scooping a powder.

The ingredient list reads more like an herbalist's shelf than a fiber supplement: slippery elm and plantain leaf for mucilage, fennel, papaya leaf and papain for digestion, pumpkin seed and pectin for bulk. It's made in a human food facility from human-grade ingredients, and it targets a sensitive stomach under stress rather than a hairball on the rug.

Because it's a dry powder, it goes into food or water rather than being eaten on its own, and at cat-sized amounts a 3.2-ounce pouch runs for months. It's labeled for both species with directions written around dogs, though, so read the cat amount before the first serving rather than after a week of overshooting.

Where it earns its place is a cat with a genuinely touchy gut: the mucilage herbs are the reason to choose this over a plain pumpkin powder, and it's the formula here that does the most beyond simple bulk. It's also the least plug-and-play of these picks — this one only works if your cat is willing to eat what it's mixed into.

A chicken-flavored tablet is not a glamorous delivery system, but it's the most adaptable one in this group. Psyllium seed does the bulk work, with slippery elm and marshmallow root alongside it — mucilaginous herbs that turn slick when wet and soothe as they pass — plus papaya and apple fiber rounding out the blend. It's the classic hairball stack in a form you can portion by half.

That's why this is our value pick and also our answer for the cat that walks away from a chew. Split a tablet into a spoon of wet food, or crush it, and most cats take it without noticing; the ones that refuse tend to refuse the smell as much as the taste, which is where a strong fishy food earns its keep. Halving matters with cats, where a small cat and a big one shouldn't get the same amount.

The tablets don't split evenly, and a firm press leaves a ragged edge — but since the backup plan is crumbling one into food, a rough break costs you nothing. What we noticed is how little ceremony the whole routine takes: one tablet, half a spoon of food, done before the bowl hits the floor.