Probiotics for Dogs and Cats: What Do They Do and Does Your Pet Really Need Them?

August 04 2026, by Michael van Wassem, 7 min reading time

Probiotics for dogs and cats: what they do, when they're useful, and what to look for when choosing a supplement.

You've probably seen it on the supplement shelf: tubs and sachets labelled "probiotics for dogs" or "probiotics for cats". Manufacturers promise better digestion, stronger immunity and a shinier coat. But what are probiotics exactly, do they actually work, and when does your pet need them?

The short answer

Probiotics are live, "good" bacteria that support the balance of the gut flora. In dogs and cats, they can be useful during or after a course of antibiotics, for stress-sensitive animals, during a food transition, or for temporary, mild digestive upset. They're not a miracle cure: for persistent diarrhoea, vomiting, weight loss or lethargy, a vet visit always comes first, not a supplement.

What exactly are probiotics?

Probiotics are live micro-organisms — usually bacterial strains such as Enterococcus faecium, Lactobacillus or Bifidobacterium species — that, given in sufficient quantity, can have a beneficial effect on the gut flora. They differ from prebiotics, which are dietary fibres (such as FOS or inulin) that feed the animal's own good bacteria in the gut. Many supplements combine both, and are then called synbiotics.

Important to know: human probiotics aren't automatically suitable for dogs or cats. The gut flora of each species is different, which is why most pet supplements contain strains specifically tested on dogs or cats.

How do probiotics work in your pet's body?

The gut of dogs and cats hosts an enormous diversity of bacteria that together form the microbiome. This microbiome helps digest food, produces certain vitamins, and helps regulate the immune system — a large part of the body's defences sits in and around the gut wall. When that balance is disrupted, for example by medication, stress or a sudden change of food, "unwanted" bacteria can temporarily gain the upper hand. This often shows up as soft stools, gas or a reduced appetite. Probiotics supply extra good bacteria to help restore that balance more quickly.

When can probiotics be useful?

Probiotics are most often recommended in the following situations:

• During or after a course of antibiotics — antibiotics don't distinguish between harmful and beneficial bacteria, so the gut flora can be temporarily disrupted.
• During a food transition — a new food, brand or recipe can briefly upset the gut. Probiotics can help smooth out that transition (alongside the usual gradual switch over 7 to 10 days).
• During stressful periods — a house move, boarding stay, vet visit or a new pet in the house can cause soft stools in sensitive animals.
• For mild, short-term digestive upset — such as occasional soft stools with no other signs of illness.
• For seniors or pets with a sensitive digestion — gut flora can become less stable with age or in certain breeds.

What does the science say?

Interest in the pet microbiome has grown considerably in recent years, including within veterinary medicine. Research in dogs and cats shows that certain, well-studied strains (such as Enterococcus faecium SF68) may contribute to a shorter recovery time from acute diarrhoea and to more stable stools during stressful periods. Veterinary nutrition organisations such as the WSAVA (World Small Animal Veterinary Association) recognise the importance of a healthy microbiome, but also stress that not every product is the same: the effect depends heavily on the specific bacterial strain, dosage and quality of the supplement.

To be fair: for many of the health claims on packaging — such as "shinier coat" or "stronger immunity" — the scientific evidence in companion animals is still limited or comes mainly from small-scale studies. That doesn't mean probiotics are useless, but healthy scepticism towards big promises is warranted. If you're unsure whether your dog or cat would benefit from a supplement, for example with recurring issues, discuss it with your vet.

What to look for when choosing a probiotic supplement

Not every tub labelled "probiotics" is equally worthwhile. When choosing, look out for the following:

• Species-specific — choose a supplement developed specifically for dogs or cats, not a human product.
• Stated number of live bacteria (CFU) — a reliable product states the number of colony-forming units (CFU) per dose, not just "contains probiotics".
• Named bacterial strains — the more specific the strain (for example Enterococcus faecium), the better you can judge what you're buying.
• Storage instructions — some probiotics need to be kept cool and dark to keep the bacteria alive; read and follow this advice.
• Expiry date — live bacteria decrease in number after the expiry date, so don't buy more than you'll use in time.
• Gradual build-up — start with the recommended dose and follow the instructions on the packaging or from your vet.

Common mistakes with probiotics

• Giving a human probiotic to a dog or cat — not all strains are suitable or tested for pets.
• Expecting it to solve an acute problem instantly — probiotics support recovery, but don't replace a vet visit for persistent symptoms.
• Storing it too long in a warm spot — this kills off many live bacteria before your pet gets them.
• Combining freely with other supplements — check with your vet if in doubt, especially if your pet is already on medication.
• Stopping at the first sign of improvement — follow the recommended course length for a more stable result.

Frequently asked questions about probiotics for dogs and cats

Can I just give my dog or cat probiotics preventively, even without symptoms?
You can, and some owners do this as standard practice during stressful periods. However, evidence that daily preventive use in a healthy animal without symptoms provides measurable benefits is limited. If in doubt, discuss it with your vet.

Can I give plain yoghurt as a natural source of probiotics?
Some dogs tolerate a small amount of plain yoghurt without additives well, but many cats are lactose intolerant and get diarrhoea from it. A pet-specific supplement is a more reliable choice than dairy.

How long before I see an effect?
With mild symptoms, you'll often see improvement within a few days to a week. If there's no improvement, consult your vet.

Is it safe to combine probiotics with a course of antibiotics?
Yes, this is often actively recommended, but ideally give them a few hours apart from the antibiotics, unless your vet advises otherwise.

Do probiotics also help with stress-related behaviour?
Probiotics act on the gut flora, not directly on behaviour. There's growing interest in the so-called gut-brain axis, but for behavioural issues, targeted guidance or training is a more effective approach than a supplement alone.

In short

• Probiotics are live bacteria that can support the gut flora of dogs and cats.
• Useful during antibiotic use, food transitions, stressful periods, or mild, short-term digestive upset.
• Choose a species-specific product with a stated CFU count and named bacterial strains.
• Not a replacement for a vet visit if symptoms are persistent or severe.
• Store according to the packaging instructions to keep the bacteria alive.

Conclusion

Probiotics aren't a miracle cure, but in the right situation — a food transition, a course of antibiotics, or a stressful period — they can be a valuable, well-supported way to help your dog's or cat's gut flora. Choose a species-specific supplement with a clearly stated live bacteria count, and always involve a vet if symptoms persist. Not sure which product suits your pet? Your vet or local pet supply store can advise on a species-specific probiotic supplement.

Tags

Gezondheid & Preventie Honden Katten Kennisbank Voeding

• Share on:
• WhatsApp
• Deel
• X
• Pin it
• Messenger
• Email