Postbiotics for Pets:
What They Are and
Why They Matter

PLUS: Pre vs Probiotics Explained!

Prebiotics vs Probiotics vs Postbiotics for Pets: A Simple Definitive Guide

Updated: December 12, 2025

Gut health plays a major role in your pet’s long-term wellness — far more than most people realize. Research suggests that about 70% of the immune system lives in the gut, and the microbiome also has a strong connection to mental and emotional balance through what’s known as the gut-brain axis.(1)(2)

 

If you’ve heard the words prebiotics, probiotics, and postbiotics and wondered what they actually mean — and which matter most for cats and dogs — this guide will break them down simply and clearly.

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Why Gut Health Matters for Cats and Dogs

A healthy gut microbiome supports:

  • immune strength
  • digestion and nutrient absorption
  • healthy inflammatory response
  • behavior and stress resilience (gut–brain axis)
  • skin & coat condition
  • overall vitality

Because gut health impacts everything, understanding how prebiotics, probiotics, and postbiotics work is key to choosing the right digestive support for your pet.

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What are Postbiotics? 
The "New" Science with Big Benefits

Postbiotics have technically been around forever — your pet’s gut bacteria produce them naturally every day. They’re also present in fermented foods like yogurt, sauerkraut, kimchi, and kombucha.

 

So why aren’t they widely known?

 

Postbiotics are only recently gaining mainstream attention in the U.S., even though many other parts of the world have been studying and using them for years. It’s very similar to probiotics 20–25 years ago — and now probiotics are everywhere. Postbiotics are on that same trajectory.

 

Before we dive deeper into postbiotics, let’s quickly define the three terms:

1. Prebiotics: 
The Food Source for Good Bacteria

Prebiotics are non-digestible carbohydrates that serve as food for probiotics (beneficial bacteria).

Common examples include:

  • inulin
  • fructooligosaccharides (FOS)
  • xylooligosaccharides (XOS)

The challenge with prebiotics for pets

Because they are not digested by cats or dogs, prebiotics can sometimes cause:

  • gas
  • bloating
  • diarrhea

Especially in sensitive pets, high doses can be irritating — so careful formulation and dosing are crucial.

2. Probiotics: 
The Beneficial Gut Bacteria

Probiotics are the living microorganisms that make up your pet’s gut flora (the microbiome).

 

Cats’ and dogs’ microbiomes contain:

  • trillions of bacteria
  • thousands of known phylotypes (3)

But here’s the problem:

Commercial probiotic supplements typically contain only 40–50 specie strains — a tiny fraction of what naturally exists in the digestive system.

 

This is why many probiotic supplements help, but not to the level people expect. Their biggest benefit actually comes from the postbiotics they produce…

3. Postbiotics: 
The Powerful Compounds That Do the Real Work

Postbiotics are the beneficial byproducts that probiotics create during their life cycle.

They include:

 

Dead probiotic cells & fragments

These stimulate a positive immune response and are known as tyndallized (heat-killed) probiotics

 

Metabolites

This category includes many of the compounds responsible for gut and immune health:

  • short-chain fatty acids (SCFAs) like butyrate and propionate
  • immune-supportive molecules
  • peptides
  • vitamins
  • antimicrobials
  • other bioactive substances (4)

These compounds are what deliver so many of the digestive, immune, and behavioral benefits people typically associate with probiotics.

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Why Postbiotics Are Becoming So Popular

Postbiotics offer several advantages over probiotics:

  • They are safe and stable — no risk of dying during storage or digestion.
  • They do not require refrigeration.
  • They work even in compromised gut environments, where probiotics may not survive.
  • They directly deliver the compounds responsible for gut and immune support.

This is especially important for pets with:

  • digestive issues
  • allergies
  • sensitive stomachs
  • immune concerns
  • chronic stress or behavioral issues

Postbiotics are one of the most promising modern tools for supporting whole-body health — especially in cats and dogs.

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Summary: 
Prebiotics vs Probiotics vs Postbiotics

Type:

What:

Pros:

Cons:

Prebiotics

Fiber that feeds probiotics

Helps bacteria thrive

Helps bacteria thrive

Probiotics

Live, beneficial bacteria

Supports microbiome

Many strains don't survive digestion; limited diversity

Postbiotics

Beneficial compounds produced by probiotics

Highly stable, effective, low-risk

Less understood by consumers (for now!)

Coming Next: A Deep Dive into Postbiotics

Now that you understand the difference between prebiotics, probiotics, and postbiotics, stay tuned for our next article — a deeper look into specific postbiotics, their health benefits, and why they’re one of the most exciting advances in feline (and canine!) gut health.

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Article References

  1. If you want to boost immunity, look to the gut - Sandy Cohen • UCLA Health, March 19, 2021 
  2. Pay attention to your gut-brain connection-It may contribute to your anxiety and digestion problems
    Harvard Health Publishing-Harvard Medical School, April 19, 2021
  3. Intestinal Microbiota of Dogs and Cats: a Bigger World than We Thought - Jan S. Suchodolski, Med Vet, Dr Med Vet, PhD
    Vet Clin North Am Small Anim Pract. 2011 Mar; 41(2): 261–272. Published online 2011 Apr 12. doi: 10.1016/j.cvsm.2010.12.006
  4. Health Benefits of Heat-Killed (Tyndallized) Probiotics: An Overview
    Int J Mol Sci. 2019 May; 20(10): 2534. Published online 2019 May 23. doi: 10.3390/ijms20102534

About the Author

Eric has a degree in Microbiology from the University of Wisconsin-LaCrosse and has worked in the food and nutritional supplement industry for 25+ years, specializing in probiotic and enzyme formulation. He has also co-authored several peer-reviewed journal articles. He's a proud cat dad for 4 furry children and enjoys using his knowledge to develop products to improve their health.

Support your pet’s gut, immune system, and digestion with a safe, stable, powerful postbiotic.

Explore our Microbiome Booster Postbiotic for Cats & Dogs:

About the Author

Eric has a degree in Microbiology from the University of Wisconsin-LaCrosse and has worked in the food and nutritional supplement industry for 25+ years, specializing in probiotic and enzyme formulation. He has also co-authored several peer-reviewed journal articles. He's a proud cat dad of 4 furry children and enjoys using his knowledge to develop products to improve their health.

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Shipping

Return/Refund Policy

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Contact Us

Learn More

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Why Homemade Cat Food?

FAQs

How We Ensure Quality

Resources

Homemade Food Directions Hub

The Cat's Meow Blog

Free DIY Cat Food Recipe

International Inquiries

Policies

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