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1,215 Reviews
Petlonga Gut-Balance Shield
She's eating more than ever and still getting lighter. That isn't old age, it's an absorption problem, something is taking her food before her body can reach it. Gut Balance Shield rebuilds the gut colony that lets her clear it and finally get fed by her own meals again.
Rebuilds the gut colony
Repairs the lining
Restores absorption
Natural Fish-flavored
93% Sold
Ships by
From US warehouse
Ingredients
A daily formula built to rebuild the bacterial colony that runs your cat's gut, six probiotic strains, a prebiotic to feed them, and soothing botanicals to repair the lining. It's the system her body uses to absorb food and clear what doesn't belong there.
Product Information
Our vet-formulated probiotic delivers 6 targeted strains and 500 million CFU, plus inulin prebiotics, digestive enzymes, omega-3 salmon oil, and soothing marshmallow root, built to rebuild the gut colony your cat's food strips out, not just top it up.
- Rebuilds the Colony -- 6 live strains, led by L. plantarum, re-establish the population that keeps her gut lining working and moving things through
- Repairs the Lining -- Marshmallow root and pumpkin coat and calm the surface a parasite flattens, the same surface she absorbs through and the bacteria grow back on
- Restores Absorption -- Pancreatin Fungal 4X enzymes and prebiotic inulin help her get the nutrients from every meal instead of losing them
- Supports Weight & Vitality -- Norwegian salmon oil adds omega-3s for coat and energy, so she can feel like herself again
Directions for Use
- Scoop -- Measure 2 scoops (1g each) of powder
- Sprinkle -- Add directly to your cat's food
- Mix -- Stir in and serve
Two scoops daily. Best mixed with wet food. For dry food, add a small splash of water to help the powder stick.
Shipping & Guarantee
Shipping Free shipping on orders over $75. Orders are processed within 1-2 business days and delivered within 2-4 business days from our US warehouse.
60-Day Satisfaction Guarantee Try it risk-free. If you're not completely satisfied within 60 days, contact us for a full refund, no questions asked.
Why Pet Owners Trust PetLonga
Vet Formulated
Third-Party Tested
Third-Party Verified
Made in USA
Clears the gut
Immune Support
Absorption
No Fillers
Pre + Probiotics
Norwegian Salmon
What changes when she can absorb again
Rebuild the colony and it happens in a set order: the begging stops, the litter box clears, and then the weight comes back. Here's what owners watch for.
The Weight Comes Back
Real weight, returning.
The Begging Stops
No more crying at the bowl.
Her Body Clears It Out
The way nature intended.
The Litter Box Changes First
Firmer stool. Less smell.
Different ingredients. One decision.
Most probiotics maintain a gut that already works. A cat losing weight for months needs hers rebuilt, a different job entirely. Every part of this formula does one piece of it, at the same time.
PROBIOTICS
Rebuild the population
Six-Strain Probiotic Blend · 500M CFU
Six strains re-establish the colony that runs the clearing, led by L. plantarum, the strain with the most published feline research. A community, not a single organism that washes straight through in days.
PREBIOTICS
Feed what arrives
Inulin from Artichoke
Prebiotic inulin gives the new bacteria something to live on in a stripped gut, so they establish and stay instead of passing through, the step most cheap probiotics skip entirely.
ENZYMES
Restore absorption
Pancreatin Fungal 4X
Digestive enzymes break protein, carbs and fats all the way down so your cat absorbs the meal herself, instead of losing it to what's living in her gut.
GUT LINING REPAIR
Repair the ground it lands on
Marshmallow Root
Marshmallow root coats and calms the lining a parasite flattens, the surface she absorbs through and the one the new bacteria have to attach to. Repaired at the same time the colony rebuilds, not afterwards.
PROBIOTICS
Rebuild the population
Six-Strain Probiotic Blend · 500M CFU
Six strains re-establish the colony that runs the clearing, led by L. plantarum, the strain with the most published feline research. A community, not a single organism that washes straight through in days.
PREBIOTICS
Feed what arrives
Inulin from Artichoke
Prebiotic inulin gives the new bacteria something to live on in a stripped gut, so they establish and stay instead of passing through, the step most cheap probiotics skip entirely.
ENZYMES
Restore absorption
Pancreatin Fungal 4X
Digestive enzymes break protein, carbs and fats all the way down so your cat absorbs the meal herself, instead of losing it to what's living in her gut.
GUT LINING REPAIR
Repair the ground it lands on
Marshmallow Root
Marshmallow root coats and calms the lining a parasite flattens, the surface she absorbs through and the one the new bacteria have to attach to. Repaired at the same time the colony rebuilds, not afterwards.
Her Gut Reset Journey
Real, gradual change, in a set order. Here's what most owners notice once Gut Balance Shield is part of her daily bowl, the litter box first, long before the scale.
Week 1
Litter box smell drops, often within the first week
Stool starts holding form
Weeks 2-3
The frantic hunger settles
She finishes her bowl and walks away instead of begging
Weeks 4-6
The wasting stops, weight steadies
You stop feeling her spine through her fur
Week 8+
Weight and energy keep returning, ounces at a time
Continued daily use keeps the colony strong, so the next egg meets a cat who can clear it
84% of long-term users continue Gut Balance Shield as daily maintenance.
Feature
PetLonga
Basic Probiotics
Re-establishes a depleted colony
Feeds the bacteria so they stay
Six strains, not one
Repairs the absorbing lining
Made for cats
PetLonga vs. Basic Probiotics
Built to Rebuild, Not Top Up
Six strains led by L. plantarum re-establish a population, instead of adding one strain to a gut that has nothing left to hold it.
Feeds Good Bacteria
Inulin feeds the new bacteria so they actually establish and stay, rather than washing through in a few days.
Supports Digestion
Marshmallow root repairs the lining the parasite flattened, the same surface she absorbs through and the bacteria have to grow back on.
What's on the Label Reaches Her Bowl
Third-party and stability tested at end of shelf life, so the strains are alive in the amounts on the label when they reach her, not just when they left the factory.
Try PetLonga Risk-Free
60-day money-back guarantee
Why pet owners trust PetLonga
Vet-Formulated
Vet-Formulated
Third-Party Tested
3rd-Party Tested
Clinical-Grade Ingredients
Clinical-Grade
Made in the USA
Made in USA
No Fillers
No Artificial Flavors
Non-GMO
Absorption Support
Made for Cats Only
Easy Daily Powder
What cat owners are telling us
★★★★★ 4.8 · 1,215 verified reviews
★★★★★
I stopped feeling his spine
Baxter is 14 and was eating two bowls a day while melting in front of me, every panel came back “normal.” Nine days in, the litter box smell was just gone. By week four I ran my hand down his back and the ridge of bone that had scared me for months wasn’t there. He’s heavier than he’s been in a year.
KH
3 weeks ago
★★★★★
The begging finally stopped
Olive would clean her bowl and then cry at it like I’d never fed her. It wrecked me. Ten days on this and she eats, then wanders off to the window. That was the moment I knew something had actually changed, before the scale ever moved.
MT
1 month ago
★★★★★
Two dewormings never held. This did.
We treated Smokey twice in a year and he never put the weight back either time. This is the first thing that’s actually stuck. Four months now, steady at 9 lbs. I just wish I’d found it before all the vet bills.
PN
2 months ago
★★★★★
My fussy girl actually eats it
I’ve binned more supplements than I can count because Mochi smells them and walks off. The fish flavour, she doesn’t even notice it mixed into her food. Bonus I wasn’t expecting: the firmest, least smelly litter box in years.
DL
3 weeks ago
★★★★☆
Cautiously optimistic, now a believer
Bought it half-expecting nothing after everything else failed. Only reason it’s 4 stars is the first week I saw zero change and nearly gave up. Then the litter box shifted, then her appetite settled, and now the scale is finally moving the right way. Glad I held on.
GM
5 weeks ago
★★★★★
I’d already made the appointment
I’m not going to type out what appointment I had booked. I gave this three weeks first. She’s asleep on my chest as I write this, purring. That’s the whole review.
SK
1 month ago
★★★★★
The weekly weigh-ins finally went up
Engineer, so I logged her weight every Sunday, eight straight weeks of decline in the notebook. Started this and the line turned. Up 11 oz in the first month. I don’t care how it works, the data doesn’t lie.
TR
6 weeks ago
★★★★★
He jumps on the counter again
It’s the little things. He’d stopped getting up on the kitchen counter to supervise me cooking. Last week he was back up there trying to steal chicken like a kitten. He’s 15. He’s staying on this for the rest of his days.
YP
2 months ago
Got Questions? Here's What Cat Owners Ask Most
Why is she losing weight when she's eating so much?
Because it isn't a calorie problem, it's an absorption problem. In a senior cat with clean bloodwork, the common cause is a parasite burden her gut can no longer clear, taking her food before her body absorbs it and wearing down the surface she absorbs through. She loses the food twice.
The good appetite isn't the reassuring part, it's the symptom. Rebuild the colony that clears parasites and repairs that surface, and here's the order owners see:
The litter box first, less smell, firmer stool, often within the first week.
The begging stops, she finishes her bowl and walks away.
The weight returns, slowly, ounces at a time, as she's finally fed by her meals.
Give it a full 8 weeks. Results vary with age and how long the colony has been depleted.
Her fecal test came back clean. Doesn't that rule out parasites?
Not on its own. A fecal test doesn't look for parasites, it looks for eggs, in a sample smaller than a teaspoon.
For an egg to show up, the parasites have to be mature, they have to be shedding on the exact morning you collected (they shed in waves, not continuously), and the eggs have to be in the tiny scoop you took from an intestine several feet long. Miss any one and a real burden reads as clean.
A clean fecal isn't a negative, it's inconclusive. If she's losing weight, ask your vet for samples across several consecutive days rather than a single one.
I already tried a probiotic and nothing happened. Why is this different?
Because most probiotics are built to maintain a gut that already works, one strain, nothing to feed it, nothing for the lining. Dropped onto a depleted, inflamed gut it has nothing to hold onto and washes through in about 4 days.
A cat losing weight for months doesn't need topping up, she needs rebuilding. Gut Balance Shield uses six strains led by L. plantarum to re-establish the population, inulin to feed them so they stay, and marshmallow root to repair the lining they have to grow back on, at the same time.
It was the right idea and the wrong kind of product. This one is built for the job.
Is it safe alongside a dewormer or a prescription diet?
Yes. This isn't a drug and it doesn't attack anything, it's a population of bacteria your cat is meant to already have. It doesn't conflict with a dewormer, a prescription diet, appetite stimulants, or thyroid or kidney support.
Keep your vet appointments and keep anything that's helping. A cat who's just finished a course of medication often needs it most, because that course strips more of the population on the way out. If you like, tell your vet you're adding a multi-strain feline probiotic with a prebiotic.
Are your cat supplements easy to use?
Yes, it takes less than 30 seconds a day.
Simply add 2 scoops to your cat's food. and mix it in. That's it.
The powder blends quickly into wet or dry food with no grit or clumps. It has a natural fish flavour which even picky eaters like.
No pills to force down. No syringes. No fighting at mealtime.
Do I have to sign up for a subscription?
No, you don't have to, but we recommend it. We now offer a subscription option in addition to one-time purchases.
We introduced subscriptions because consistency is one of the most important parts of building an effective daily routine for gut support. Probiotics work best when used continuously over time, and subscriptions help make sure your cat never misses a day.
You can still choose:
- One-time purchase , no recurring charges or commitments
- Subscribe & save , automatic deliveries on your preferred schedule
The subscription is fully flexible, so you can choose the delivery frequency that works best depending on how many cats you're giving it to and how quickly you go through each jar. You can also pause, change, or cancel anytime.
What are other cat owners saying?
Owners of senior cats are sharing the same story:
"She's finally holding weight.", Linda M. Wasting for a year with every test clean; within two months the weight started coming back.
"The litter box changed in days.", James K. Less smell, firmer stool, and the begging stopped within two weeks.
"I stopped feeling her spine.", Rachel T. After two dewormings that never held, this was the first thing that did.
The pattern we hear most: the litter box changes first, then the begging stops, then the weight comes back.
Is this formula science-backed?
Yes. Every ingredient is chosen from published research, not trends.
The response that expels a parasite from a cat's gut, researchers call it weep and sweep, is driven by the bacteria living on her intestinal wall. They keep the lining producing mucus and the wall contracting; that's what loosens a parasite and moves it out. Deplete that population and the response weakens; restore it and it comes back.
Our 6-strain blend delivers 500 Million CFU, led by L. plantarum, the strain with the most published feline data, to rebuild that population.
Prebiotic inulin (from artichoke) feeds the new bacteria so they establish, not just pass through.
Marshmallow root and pumpkin soothe the lining a parasite flattens, so the colony can re-establish on healthy tissue and she can absorb through it again.
Stability tested at end of shelf life, so what's on the label is what reaches her bowl.
Do you offer free shipping?
Yes, on orders over $74.95, shipping is completely free.
Most customers qualify by stocking up with 2 jars, which also ensures you don't run out mid-routine.
Orders under $74.95 ship at a flat rate calculated at checkout.
How does the 60-day money-back guarantee work?
Simple. If you're not happy, you get your money back.
Try it for up to 60 days. If you don't see a difference in your cat, or you're not satisfied for any reason, just reach out to our support team.
No hoops to jump through. No awkward questions. We'll refund your purchase.
We offer this because we're confident in the formula. Most customers see real results. But if it's not the right fit for your cat, you shouldn't be stuck paying for it.