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Gut Rebuild for Cats

Precision probiotic for mild or moderate digestive symptoms

Restores key native microbes and critical gut function

Promotes ideal stool consistency in cats with moderate diarrhea or constipation

Ideal for use in cats with microbiome disturbances, such as from medication use

Provides advanced microbiome care in aging cats

Validated by double-blind, placebo-controlled studies in cats in homes

$9500

Try it risk-free. Not seeing a difference? Get your money back on your first order within 90 days.

Ingredients

  • Active Ingredients

    Per 2 capsules:

    • Saccharomyces boulardii, 1.8 Billion CFUs
    • Peptacetobacter hiranonis subsp. felis, 100 Million AFUs
    • PreforPro® (LH01-Myoviridae, LL5-Siphoviridae, T4D-Myoviridae, LL12-Myoviridae), 6.5 mg

    Gut Rebuild has a tangy or yeasty smell; this is normal and expected.

  • Inactive Ingredients

    Trehalose; silicon dioxide; vegetarian, modified cellulose capsule.

Product Overview

About the Ingredients

Gut Rebuild for Cats features Peptacetobacter hiranonis (felis), a feline-specific probiotic strain considered a keystone species in the cat gut microbiome. Isolated from a healthy cat and validated through rigorous safety and efficacy trials by Animal Biome’s team of microbiome experts, P. hiranonis (felis) converts primary bile acids into beneficial molecules that support healthy digestion and strengthen gut defenses.

The science-backed probiotic Saccharomyces boulardii, and the proprietary phage blend PreforPro® work together to provide fast-acting symptom relief and support the colonization of P. hiranonis (felis) for restored microbiome balance.

Is this the right product for my cat?

Gut Rebuild is designed to promote more symptom-free days in cats with occasional or intermittent digestive issues. It supports deeper microbiome restoration than Gut Maintain, but is not a full ecosystem replacement like Gut Restore. 

Gut Rebuild is a powerful tool to help the microbiome recover from disturbances, especially antibiotic use, which can significantly reduce P. hiranonis (felis) levels. 

For cats with severe and longstanding digestive issues, Gut Rebuild can be used alongside Gut Restore for comprehensive microbiome restoration and symptom relief. 

Directions for Use

Administer 2 capsules per day. Capsules can be opened or given whole.

  • For sensitive cats, start with one capsule per day and slowly transition up to two capsules per day. 
  • Gut Rebuild capsules can be administered whole, or they can be opened to mix the powder with food. 
  • The daily recommended amount of Gut Rebuild can be given together or at different times, with or without food. 
  • To maximize the benefits of Gut Rebuild, give continuously for at least 30 days. Foundational microbiome shifts take time!

Not for use in cats with severe constipation.

As with all supplements, consult with your veterinarian before use, especially if your pet has a health condition.

Storage Instructions

Gut Rebuild is thoughtfully packaged to keep its probiotics safe and potent from our door to yours. Once the bottle is opened, store in a cool, dry place. Do not refrigerate or freeze.

The best-by date for Gut Rebuild is generally 8 months from the purchase date.

  • 5 stars: 9 (90%)
  • 4 stars: 1 (10%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
T
Tiny Plop's mom (Bloomington, US)
Finally, constipation relief!

My poor tuxedo boy has had issues with constipation ever since starting medication for anxiety. I have been using vet prescribed medications to help with it, but they were never very dependable, and he disliked one of them. When the email for this came through my inbox, I jumped on it and ordered 3 months right away. I am very happy to say that after almost two months on this, and actually, since the first day I started giving it to him, he has been able to have a bowel movement twice a day. There have been a few exceptions where he didn't manage twice a day, but it is such an improvement! I open the capsules and mix it into his breakfast and dinner, and he seems to enjoy the taste. He is a happier boy, for sure!

A
Amanda Montane (Portland, US)
My baby is finally happy!

When my kitten was 3 months old, she contracted cryptosporidium parasite and became extremely ill. For months she had severe diarrhea and dehydration needing constant vet visits and fluids. We had tried every medication and antibiotic available for her. After about 6 months of her being miserable, we discovered animal biome gut restore and gave it to her for several months. It helped a ton but not completely, and pilling her was no fun for anyone. When we got the option to be a part of gut rebuild study I jumped on it, desperate for any help. After the first month I noticed a huge difference in her stool consistency, it was better than it ever looked. I knew she wasn’t on the placebo because of the drastic change I’d seen. I was shocked when they mistakenly told me she wasn’t on the placebo. A week later they apologized for their error and confirmed she did receive the gut rebuild. I knew it because of how much better she’s been since giving it to her. She’s finally the happy little kitty that plays and loves again, I am so grateful!

K
Kiersten K. (Santa Fe, US)
Participated in clinical trial

William was a neonatal bottle baby I received as a foster when he was 3 days old. After he was weened and on solid food, his stools were always loose and very smelly. At 8 months of age, William had been on s. Boulardii FOS powder for his irregular stools. His stool consistency was normal on the s. Boulardii but still very smelly, since being on the Gut Rebuild, the smell has become less severe and he loves to eat the powder by itself. I would definitely recommend this product.

S
Sara N (Lake Villa, US)
Improved autoimmune flare-ups

Our 4-year-old male cat has an autoimmune disorder. Over the course of the trial period on Gut Rebuild, his symptoms improved, and he had fewer flare-ups than usual. We are continuing to provide the probiotics with his food and are really excited to see him feel better. He is more social than ever and seems like a genuinely happy cat.

M
Mariella Ross (Newark, US)
Making very gradual improvements

Millie, a rescue cat now 14yo, is under the care of an Internal Medicine specialist for diabetes and IBD. She has had "pudding poo" only, not formed, for the entire 20 months we have had her, with nothing making a significant impact on her diarrhea. She has been on Animal Biome Gut Restore for Cats, and Gut Rebuild for more than 6 months, and we are seeing some slight transition toward formed feces, but within any given day, it can be near liquid or near formed from her multiple episodes daily. Her vet is highly supportive of Animal Biome, and has also prescribed budesonide and B12 for her. She has heart issues as well, and takes Pimobendan for that. We call her our "trifecta kitty), three+ ailments. We are grateful for any progress the Animal Biome products have given her.

D
Denise L. (Denver, US)
Participated in the clinical trial, positive results

I have used animal biome products for over a year now when their gut restore saved the life of my very critically ill kitty. I was happy to get a chance to participate in the clinical trial for this new probiotic. One of my kitties had a sever mycoplasma upper respiratory infection as a neonate kitten. This required him to be on 9 rounds ( 3 a month long) the first year of his life. He then developed an inflammatory nasal polyp and had severely damaged nasal turbinates. This requires him to be on antibiotics a couple times a year. He has never gotten diarrhea from them, however his stools have never really been normal. They were formed and held their shape but pretty soggy/squishy. I was a little concerned about the S. Boulardii as he did not have diarrhea. I do use this product for two of my other kitties who have IBD and know it works great. Since Odin did not have loose stools I was worried it might make him constipated. It did not. Within a week of starting the Gut Rebuild Odins stools became completely normal, what I call perfect poops. This past week I have started one of my kitties with IBD on this as he just had to have surgery and was put on antibiotics. Since he already has bowel issues I did not want him to get too out of wack. The gut rebuilt has normalized his diarrhea after 4 days. Very pleased with the results from this product and glad to have a products that really works to rebalance the gut biome after Odin needs another round of antibiotics. Thank you Animal Biome!

J
Jamie

Best product of its kind out there!!!

Thank you for providing this feedback on Gut Rebuild for Cats! We're so glad to be able to play a role in your kitty's health journey.

C
Cynthia Patton (Fayetteville, US)
Great product

This really helped our 13 year old cat who has gallbladder concerns that led to killing off his gut “stuff”. He has been on it 60 days, eating well, no diarrhea and will see his specialist next week to see if he should stay on it or go back to gut maintain. One caveat is the current bottle caked. We live in southeast and house humidity is about 70% so we put new bottle in fridge.

P
Peri Mcginnis (Hardeeville, US)
Much needed Product for after Antibiotic use

Finally a great product from a trusted business for replenishing the gut after antibiotic use which will destroy the healthy and needed bacteria to keep the gut healthy and working properly.

k
kWhitt (Las Vegas, US)
Help after Antibiotics

Bob did two courses of antibiotics over several months for an anal gland rupture. He was in need of Repairing his gut. Before this product, Bob was obsessive with eating grass, he would vomit routinely, and his litter box habits were inconsistent.
While Bob was on the Gut Rebuild, he didn’t throw up once, did not obsess for grass and he was having a BM daily.
Since this was the only change in his routine, I’m convinced that this product helped repair his gut.
My only negative, is that Bob would not eat his homemade raw meal if it had the daily scoop in it so I had to put the daily dose into a food that he couldn’t resist (Wellness pate). I don’t blame the product because Bob can tell whenever I add anything different to his food.

This will be my “go-to” whenever I need to rebuild.

Frequently Asked Questions

How does Gut Rebuild work?

Gut Rebuild contains three powerful ingredients that work synergistically to support a healthy gut microbiome for optimal digestion and overall health. The cat-specific probiotic Peptacetobacter hiranonis subsp. felis (“P. felis” for short) helps build a supportive environment for beneficial bacteria. S. boulardii provides fast-acting digestive relief. PreforPro® targets harmful bacteria to allow healthy microbes to flourish.

Which cats benefit most from Gut Rebuild?

Gut Rebuild is designed for cats with mild to moderate digestive issues. It can be especially beneficial for cats lacking P. felis, which is common in senior cats (9 years or older) as well as cats who have recently taken antibiotics like Flagyl (metronidazole) or Tylan (tylosin).

Why is P. felis so important?

P. felis is considered a keystone species in the feline gut, which means that it plays a critical role in maintaining a stable, healthy, and resilient microbiome. Even at low levels, it helps support an environment where other beneficial bacteria can grow and function properly.

Are there any risks associated with Gut Rebuild?

Gut Rebuild was specifically formulated to be safe and gentle for cats with sensitive digestion. However, in very rare cases, adverse reactions can occur. If your cat’s condition worsens after beginning Gut Rebuild, temporarily discontinue use and consider a slower reintroduction.

Can I continue my cat's other medications or supplements?

In general, medications and supplements can be continued while taking Gut Rebuild, with the exception of highly concentrated bacterial probiotics (e.g. Lactobacillus, Bifidobacterium, Enterococcus). 

The yeast probiotic, S. boulardii, can be used with Gut Rebuild because it supports beneficial cat-specific bacteria. We always recommend speaking with your veterinarian before starting a new supplement.