How to choose a cat probiotic: strains, CFU and feeding - the Hong Kong guide
Soft stools, hairballs, or a bout of diarrhoea every time you change food? Cats have famously touchy stomachs, and probiotics have become the everyday supplement most cat owners reach for. Go looking for one, though, and you get a dozen brands, CFU counts competing to look biggest, and powders, mousses and capsules to pick between - so which one actually suits your cat? Nana goes through it with you, point by point.
Why would a cat need probiotics?
A cat's gut is home to hundreds of millions of microbes, and digestion only runs well when the good and bad bacteria stay balanced. These are the situations that tip that balance:
- Changing food - the transition from one food to another is when stomachs complain most
- Stress - moving house, a new family member (human or feline), a trip to the vet
- After a course of antibiotics - antibiotics can affect beneficial bacteria as well as harmful bacteria
- Age - digestion naturally gets weaker
- Long-running soft stools, or poo that smells unusually bad - a common sign the gut microbiome is out of balance
What a probiotic does is top up the good bacteria and help the gut hold its balance - everyday support, not medication. If your cat has ongoing diarrhoea, vomiting or low energy, see a vet first.
How to choose: the four things that actually matter
① Look at the strain, not just the word 'probiotic'
'Probiotic' on the front of a pack tells you very little - what you want is the named strain. DE111® (Bacillus subtilis) (research papers) is a patented strain with clinical research behind it, and its spore form stands up to stomach acid, so it reaches the gut intact before it gets to work. Turn the pack over before you buy and look for a strain name. If there isn't one, that's a question mark.
② CFU counts: more isn’t always better
CFU (colony forming units) is the count of live bacteria. Different strains work at different amounts, so there is no single 'bigger is better' number - Zesty Paws Cat Probiotic Powder, for example, has at least 400 million CFU of DE111® Bacillus subtilis per packet, plus Saccharomyces boulardii. What counts is whether the strain has research behind it, how it handles acid, and how the packaging keeps it alive - not who prints the biggest figure.
③ Choose a format your cat will accept
The best probiotic on the shelf is worth nothing if your cat won't eat it. Powder goes straight onto the food and stirs in, barely smells of anything, and is the easiest thing to give day after day. Mousse is snack and supplement in one, and fussy cats put up almost no resistance. Capsules and tablets? Anyone who has ever pilled a cat knows. Skip them.
④ Go for a cat-specific formula
Cats and dogs have different gut flora and different nutritional needs, so a dog probiotic should not go to a cat. Pick something that says for cats on the pack, with the serving size worked out for cats.
For your first buy, go for single-serve packets - each one is fresh, the amount is measured for you, and they travel to the cattery or on holiday with you.
How to feed it: three steps
- Step 1: one serving a day, sprinkled over the food and stirred in (wet food mixes more evenly)
- Step 2: feed at the same time each day - the gut likes routine
- Step 3: give it for at least 2 to 4 weeks before assessing the results - probiotics are a long-term habit, not an instant answer
If you want to use it through a food change, start a few days before the switch and keep going until the changeover is finished. The stomach copes far better that way.
Where to buy in Hong Kong
If you already buy American brands you will know Zesty Paws - a US pet supplement brand whose cat range is held to the same standards as the rest (NASC Quality Seal, made in the USA). Their Cat Probiotic Powder is a tidy example of all four points above: the patented DE111® strain, a formula developed for cats, 30 single-serve packets, and a pumpkin flavour that still gets eaten when it goes over the food.
Patented DE111® strain · 30 single-serve packets · pumpkin flavour | HK$274, free SF Express delivery on orders of HK$300 or more
Zesty Paws Cat Probiotic Powder →If your cat is a famous fusspot and won't touch powder, the digestion mousse is worth a look - note that it has no probiotics in it. It uses DIGESTUMMY™ seaweed for dietary fibre and omegas, to support digestion and the gut flora:
DIGESTUMMY™ seaweed fibre digestion formula (no probiotics) · up to one tube a day · an option for fussy cats | HK$143
Zesty Paws Digestion Mousse →Want to see the whole cat range in one go? Take your time in the cat section.
Common questions
Do probiotics need to go in the fridge?
Depends on the product. Spore-forming strains such as DE111® are fine somewhere cool at room temperature, and single-serve packets are even less of a worry. With an opened jar, screw the lid down tight and keep it away from heat and damp.
Can I give it with something other than cat food?
Yes - stir it into wet food, freeze-dried food or a little cat broth. Don't mix it into anything piping hot; heat kills live cultures.
How long before stool consistency improves?
Usually 2 to 4 weeks of daily feeding. If a whole month goes by with no difference at all, or the diarrhoea gets worse along the way, bring the product details to your vet.
Can kittens have it?
Zesty Paws Cat Probiotic Powder is labelled for All Ages, and it is 1 packet a day with no weight calculation. Check with your vet before a kitten's first serving, and keep an eye on the stools and the energy levels while they are on it.
NanaPaws' chief taste-tester and gatekeeper. NanaPaws is an authorised Zesty Paws retailer in Hong Kong, the batch expiry date is listed on every product, and Free SF Express delivery on orders of HK$300 or more.
This article is general pet care information and is not veterinary advice. Supplements are everyday support and do not replace veterinary care; if your cat has ongoing symptoms, please speak to your vet.
