If you have ever bought a probiotic for your dog and wondered whether it was actually doing anything, you are asking exactly the right question. The honest answer: for most products, probably not much — and heat is the main reason why.
Live bacteria are fragile by nature
Probiotics are live microorganisms. That is the whole point. But living things can die, and probiotic bacteria are surprisingly easy to kill.
They are sensitive to:
- High temperatures — heat above around 40–50°C damages or kills most conventional strains
- Stomach acid — bacteria that survive manufacturing still have to survive the acidic environment of a dog’s stomach before reaching the gut
- Time and humidity — even at room temperature, bacterial counts drop gradually over shelf life
When a product works, it is because enough live bacteria survive all three of those hurdles and actually reach the intestine. When it does not work, it is usually because the bacteria never made it that far.
Why manufacturing kills most conventional probiotics
Most dog probiotic chews are made the same way biscuits are — they are baked. Baking uses temperatures well above 100°C. At those temperatures, conventional probiotic strains simply die. The bacteria that were alive when the ingredient was added are, for the most part, dead by the time the chew comes out of the oven.
Some manufacturers spray probiotics onto the surface of the chew after baking, which is better but still leaves bacteria exposed to heat during storage and transit.
This is not a fringe problem. Live bacteria are fragile, and a probiotic can lose much of its potency between the factory and your dog’s bowl. The number printed on the label is not always the number that actually survives to reach the gut, which is exactly why heat-stability matters so much.
CFU stands for colony forming units — it is the standard way of measuring how many live bacteria a product contains. The CFU number on the label tells you what the manufacturer intended; it does not always tell you what survived.
What “heat-stable” actually means
Heat-stable does not mean the product was simply stored in a cool place. It refers to whether the bacterial strains themselves can survive heat — and that comes down to biology.
Spore-forming strains are a fundamentally different type of bacteria. Species like Bacillus coagulans and Bacillus subtilis can form a protective shell around themselves called an endospore when conditions become hostile. Inside that shell, the bacteria can survive temperatures, dryness, and acidity that would kill conventional strains outright. When conditions become favourable again — for example, inside a dog’s gut — they germinate and become active.
This is not a new technology. Bacillus strains have been used in human and animal nutrition for decades precisely because of this stability.
The second factor is the manufacturing process. Even with spore-forming strains, a high-heat baking process creates unnecessary stress. A cold extrusion process — which shapes the chew at low temperatures without baking — removes that risk and preserves bacterial viability through manufacturing.
Heat stability matters especially in India, where ambient temperatures during summer, during warehouse storage, and during last-mile delivery can easily exceed 40°C. A product that survives manufacturing can still lose significant viability sitting in a hot delivery truck or warehouse.
You can read more about the specific strains we use on the TrueWag ingredients page and the science behind why gut health matters on our science page.
How TrueWag approaches this
TrueWag uses a combination of spore-forming strains — including Bacillus coagulans and Bacillus subtilis — and a cold extrusion manufacturing process. Together, these give a measured heat-stable survivability of around 83%.
That 83% figure matters because it is not a marketing claim — it is a measurement of how many of the bacteria in the chew are still alive and viable after the manufacturing process, before the product even leaves the facility.
There is a second layer of honesty built into this. TrueWag manufactures each batch at 9 billion CFU but labels the product at 6 billion CFU. That 1.5x overage exists because bacterial counts decline over shelf life. By starting higher, TrueWag ensures that a dog eating the product at month 18 or month 24 of a 24-month shelf life is still getting close to the full labelled dose — not a fraction of it.
The product is manufactured in Jaipur, India, contains 5 strains, and carries a 24-month shelf life.
What to look for when choosing a probiotic for your dog
When comparing probiotic products, a few questions are worth asking:
- What strains are used? Look for spore-forming strains like Bacillus coagulans or Bacillus subtilis, not just conventional dairy-origin strains like Lactobacillus alone.
- How is the product manufactured? Cold extrusion or encapsulated formats are more likely to protect bacteria than baked chews.
- Does the label state CFU at time of manufacture or at end of shelf life? End-of-shelf-life claims are the honest standard.
- Has the product been tested for actual viability? Third-party testing is more meaningful than manufacturer-stated counts.
If your dog has a specific health concern — digestive problems, recurring loose stools, skin issues, or anything else — it is always worth a conversation with your vet before starting a supplement. A vet can help you understand whether a probiotic is appropriate and what else might be going on.
For a broader look at how probiotics may support dogs generally, see do probiotics help dogs, or if you are comparing options, best probiotic for dogs in India is a useful starting point. If you are working out the right amount to give, how much probiotic for your dog covers that in plain terms. And if your dog is also doing a lot of paw licking, why dogs lick their paws looks at some of the gut-related reasons behind that habit.
If you are ready to try a heat-stable probiotic that is honest about its numbers, you can find TrueWag on Amazon India.
Frequently asked questions
What does CFU mean on a dog probiotic label?
CFU stands for colony forming units — it is a measure of how many live, viable bacteria are present in a dose. A higher CFU count only matters if those bacteria are actually alive. A product labelled at 6 billion CFU that has been heat-damaged may deliver far fewer live bacteria than the number suggests.
Are spore-forming probiotics safe for dogs?
Spore-forming strains like Bacillus coagulans and Bacillus subtilis have a long history of use in animal nutrition and are widely considered safe. As with any supplement, it is a good idea to speak with your vet if your dog has an existing health condition or is on medication.
Why does heat matter so much in India specifically?
India's climate means that probiotics face high temperatures not just during manufacturing but throughout the supply chain — warehouses, delivery vehicles, and home storage can all reach temperatures that degrade conventional probiotic strains. Spore-forming strains and low-heat manufacturing make a meaningful difference in how much survives to reach your dog.
What is the difference between a probiotic made at 9 billion CFU and labelled at 6 billion?
Live bacteria naturally decline in number over a product's shelf life. By manufacturing at a higher count — in TrueWag's case, 9 billion — and labelling at a lower count of 6 billion, the product is designed so that your dog still receives close to the labelled dose even toward the end of the 24-month shelf life, rather than a depleted count that falls short of the label.