This is a specific conversation about Dog gut health — probiotics and digestive support — ask about yours and get one honest answer for your exact situation.
inparticular.ai
Managing gut issues in a multi-dog household is tricky enough — but when your two dogs have opposite problems, you're essentially dealing with two separate cases under one roof. 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. To point you in the right direction: what breed and age is each dog, what specific symptoms is each one showing, and have you spoken to a vet about either of them?
I have a 4-year-old Labrador who has loose stools pretty much constantly — he's always been like this. And a 6-year-old Chihuahua who tends to go the other way, she gets constipated and strains a lot. Vet has seen both, no underlying disease found, just told me to look at diet and supplements.
inparticular.ai
That's a really common Lab trait, actually — Labradors are notorious for sensitive, loose guts, and it often comes down to a combination of their tendency to eat anything and a genuine susceptibility to dysbiosis. The Chihuahua situation is different: small breeds, especially older ones, often have slower gut motility and can struggle with constipation, particularly if they're not drinking enough or getting sufficient fibre. Good news is your vet has ruled out anything structural, so you're in the right space to trial supplements. Can I ask — are they on the same food, and does the Labrador's issue get worse after certain foods or is it pretty consistent regardless?
They're on different foods already — he's on a sensitive stomach kibble and she's on a small breed formula. His loose stools are pretty much constant no matter what. Her constipation is worse in summer when she drinks less.
inparticular.ai
Right, so for your Labrador I'd go with Pro-Kolin Enterogenic by Protexin. It's a paste-format probiotic and prebiotic combination specifically formulated for chronic loose stools in dogs — it uses Enterococcus faecium, one of the better-evidenced strains for dogs, alongside kaolin to firm up stools and a prebiotic to support the microbiome longer term. It's not just a one-off firming agent; used consistently it actually helps shift the gut environment. Labradors with chronic loose stools often respond well within two to three weeks. For your Chihuahua, the issue isn't dysbiosis — it's motility and hydration. What she needs is added fibre rather than a probiotic. Lintbells YuDIGEST Plus has a prebiotic fibre blend that gently supports gut transit, and the psyllium component in particular helps with constipation in small breeds. You'd give her a small daily dose mixed into her food. The two products address completely different problems, which is exactly right for what you're describing.
That makes sense. Can I give the Pro-Kolin to the Chihuahua too, or would that make her constipation worse?
inparticular.ai
I'd avoid it for her, yes. Pro-Kolin contains kaolin, which is a binding agent — it's part of why it works so well for loose stools, but giving it to a dog who already tends toward constipation could make things worse. The YuDIGEST Plus is the better fit for her because it works in the opposite direction, encouraging rather than firming up gut transit. Keep them separate: Pro-Kolin for the Lab, YuDIGEST Plus for the Chihuahua. Both are available on Amazon UK and neither requires a prescription.
Perfect, that's really clear. How long should I trial each one before deciding if it's working?
inparticular.ai
Give each one a solid four weeks before you judge. With the Lab, you should see some stool firming within the first two weeks if it's going to work — but the full microbiome shift takes longer, so don't stop at week two even if you see early improvement. With the Chihuahua, consistency matters more than speed; the fibre needs to build up in her diet. If after four weeks neither dog has improved, it's worth going back to the vet to discuss a more targeted stool culture or dietary protein trial — but most dogs in this position do respond well to the right supplement.
