One probiotic for three dogs of different sizes

Three dogs of different sizes sharing one probiotic solution is a really common ask — and the good news is it's actually more achievable than people think, because the best products dose by weight rather than by dog. That said, probiotics can make a genuine difference for dogs, but quality and strain specificity vary enormously, and what helps one dog may do nothing for another. Before I point you in a clear direction: what breeds and rough ages are the three dogs, what's prompting this — is one of them having digestive issues, or are you thinking more general gut maintenance for all of them — and has a vet been involved at any point?

That makes a lot of sense — the Lab is clearly the one who needs this most, and tagging the other two along for general maintenance is a reasonable call, especially since you're already managing their meals together. Chronic loose stools in a Labrador that's otherwise healthy often comes down to gut flora imbalance, sensitivity to something in the diet, or just the breed's notoriously enthusiastic eating habits catching up with them. A vet visit specifically about the loose stools would be worthwhile if it continues after you've given a probiotic a proper run — six to eight weeks is a fair trial. Now, for a multi-dog household with this size range, what you need is a product that's dosed by weight, uses well-researched strains, and is palatable enough that a fussy Chihuahua mix will actually eat it. Has any of the three ever refused supplements before, or are they all reasonably good about eating what's put in front of them?

That Chihuahua is your real constraint here, and it's actually the deciding factor in which format to go for. Powders and capsules that smell unfamiliar tend to get rejected by picky small dogs. What I'd recommend is Protexin Pro-Kolin Advanced — it's a paste in a syringe, which sounds fussier to use but is actually much easier to control across three different sizes. You dose it by weight: 1ml per 10kg, so your Lab gets around 3ml, the Cocker Spaniel around 2ml, and the Chihuahua gets a very small amount — roughly 0.3 to 0.5ml depending on her size. The paste has a palatable flavour that most dogs accept readily, even picky ones, and you can apply it directly to the tongue or mix it into a small amount of food. It contains Enterococcus faecium, a well-studied strain for canine digestive support, plus kaolin and pectin which help firm up stools — directly useful for the Lab's situation. One tube works across all three without any guesswork about whether they've each eaten their portion.

For the Lab, I'd run it consistently for six to eight weeks and then reassess — if the loose stools have settled and he's doing well, you can drop to a maintenance dose a few times a week rather than daily. For the other two, since you're using it preventatively, a lower ongoing dose a few times a week is perfectly reasonable and won't break the bank. Pro-Kolin Advanced isn't a forever-daily commitment for healthy dogs; think of it as something you use more actively when there's a problem and dial back when things are stable. If the Lab's stools don't improve after a proper trial, that's a clear signal to get a vet to look at diet, possible intolerances, or something else going on — probiotics help a lot of dogs but they're not a fix for every cause of chronic loose stools.

Good plan — one tube should last you a while given the Chihuahua's tiny dose. Give it the full six to eight weeks before you judge it, and if the Lab isn't showing improvement by week four or five, I'd book that vet visit sooner rather than later. Hope all three of them do well on it.