It is a sensible thought. You already have a bottle of probiotics in the kitchen cupboard, your dog's tummy has been a bit unsettled, and a capsule seems like an easy fix. Plenty of owners have wondered the same thing.
The short answer is that a probiotic made for dogs is the better and safer choice. Here is why, and what to do if your dog has already helped themselves to one.
Can I give my dog human probiotics?
It is best not to. Human probiotics are formulated, dosed and tested for people. A dog's gut, body size and sensitivities are different, and some human supplements contain ingredients that are unsafe for dogs. A probiotic designed and dosed for dogs removes those unknowns.
Are human probiotics dangerous for dogs?
The probiotic organisms themselves are unlikely to be the main problem. The risk usually sits in everything else in the product.
The biggest concern is xylitol, a sugar substitute. Australia's Animal Poisons Helpline explains that xylitol causes a dog's body to release a large amount of insulin, which can lead to dangerously low blood sugar, and that there is also a risk of delayed liver injury. The Helpline lists dietary supplements among the products where xylitol is increasingly found, along with chewing gum, sugar-free sweets and some peanut butters.
Chewable, gummy and flavoured human supplements are the ones to be most careful with. Always read the full ingredient list, not just the front of the pack.
What should I do if my dog ate a human probiotic?
- Find the packaging and check the ingredients for xylitol or other sweeteners.
- Work out roughly how much your dog ate and when.
- If xylitol is listed, or you are not sure, call your vet or the Animal Poisons Helpline on 1300 869 738 straight away, even if your dog seems well. The Helpline advises calling immediately rather than waiting for signs.
- If there is no xylitol, watch for vomiting, diarrhoea or lethargy and call your vet if anything worries you.
How are dog and human probiotics different?
Human probiotic Dog probiotic Designed for The human gut and human body weight The dog gut, with a dose by weight Additives May include sweeteners, including xylitol in some products Should be formulated without ingredients unsafe for dogs Format Capsules, gummies, powders and drinks Chews, powders and pastes made to be eaten by dogs Dosing guidance For an adult person By your dog's weight Research base Mostly human studies Should point to research in dogs for its organismIs a dog's gut really that different from ours?
Yes, in meaningful ways. A 2020 review of the canine gut microbiome by Pilla and Suchodolski describes the main groups of bacteria in healthy dogs. One of them, Fusobacteria, can be among the dominant groups in dogs. The mix of bacteria in a dog's gut is shaped by their diet, anatomy and biology, so research on people does not automatically apply to dogs.
That is the real reason to choose a dog product: not that one organism is magic, but that the formula, the dose and the evidence should all relate to dogs.
Are some probiotics used in both people and dogs?
Yes, and this is where it pays to look past the organism name. The yeast Saccharomyces boulardii, for example, is used in human products and has also been studied in dogs. In a placebo-controlled study of dogs with chronic enteropathy, dogs given S. boulardii alongside standard veterinary treatment showed greater improvement in stool frequency and consistency than dogs on placebo (D'Angelo et al., 2018).
So the question is not only "which organism?" but "was this product made, dosed and checked for dogs?" You can read more about the two main types in our guide to probiotic strains for dogs.
What about yoghurt, kefir or Yakult?
Probiotic foods made for people are tempting because they are in the fridge already. They are not a reliable probiotic for dogs:
- The type and amount of live cultures are not designed for dogs.
- Some dogs do not digest lactose well, so dairy can upset their stomach.
- Flavoured and "lite" products can contain sweeteners, including xylitol.
A small amount of plain, unsweetened yoghurt is a treat, not a supplement. Our guides to Yakult for dogs and natural sources of probiotics cover the food options in more detail.
What should I look for in a dog probiotic?
Label quality matters. When Weese and Martin (2011) tested 25 commercial veterinary probiotic products, only 2 had labels that correctly identified their organisms and contained what the label claimed. That was one study, from 2011, but it is a good reason to be choosy. Cornell's College of Veterinary Medicine suggests labels should show the exact species, the number of organisms, an expiry date and a guarantee of live organisms.
- Named organisms, not just "probiotic blend"
- A stated CFU count (colony-forming units)
- A dose by weight
- An expiry date and storage instructions
- No xylitol or other sweeteners unsafe for dogs
- Made for dogs, with research in dogs behind its organism
Our checklist for choosing probiotic chews and supplements goes further, and the dog probiotics guide covers the basics from the start.
Where does Hero Probiotic fit?
Our Hero Probiotic chews are made for dogs, vet reviewed and made in Australia. They use S. boulardii (10 billion CFU per gram) with prebiotic fibres, and the label gives a daily dose by your dog's weight. They come with a money-back guarantee. If you are not sure a probiotic is right for your dog at all, our dog gut health hub is a good place to start.
When should I see a vet?
A probiotic supports gut health. It is not a treatment for illness. See your vet if your dog has diarrhoea for more than a day or two, blood in the stool, vomiting, lethargy, weight loss or ongoing gut signs. Check with your vet before starting any probiotic if your dog is very young, elderly, on medication, or has a weakened immune system. Cornell advises that severely immunocompromised dogs only have probiotics under veterinary supervision.
The bottom line
Reaching for your own probiotic comes from a good place, but your dog is better served by one made for dogs. Keep human supplements out of reach, check any label for xylitol, and choose a dog probiotic with named organisms, a clear dose and honest claims.
