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
Loose stools during a kibble switch are genuinely common — even between two premium foods — because the gut bacteria need time to adjust to a different protein and fibre profile. That said, probiotics can make a real difference here, shortening the transition discomfort noticeably in many dogs. The catch is that quality and strain specificity vary enormously, and what works brilliantly for one dog does nothing for another. Before I point you anywhere specific: what breed and age is your dog, what does the stool situation actually look like right now, and have you had a vet check it out, or is this clearly tied to the food change?
He's a 3-year-old Vizsla, about 25kg. The loose stools started pretty much the day I began mixing the new food in. It's not watery, more just soft and shapeless. No vet visit — it feels like an obvious transition reaction. He's otherwise his usual energetic self, eating fine, no blood or anything worrying.
inparticular.ai
That picture — soft but not watery, starting immediately with the switch, dog otherwise totally normal — is classic transition disruption rather than anything sinister. At 25kg a Vizsla is a lean, active breed with a reasonably sensitive digestive system, so they can react strongly even when both kibbles are high quality. The shift in protein sources, fat levels, or fibre composition between the two foods is essentially asking the gut microbiome to adapt quickly, and it often can't without a bit of support. How far into the transition are you — are you still mixing, or have you fully moved to the new food?
Still mixing, about 60% new food now. I've been doing it over two weeks but the stools haven't really firmed up. I was going to push through but a friend mentioned a probiotic might help. That's why I'm here.
inparticular.ai
Your friend is right, and two weeks of soft stools is long enough that the gut clearly needs more than just time. For a dog in this exact situation — active adult, mid-transition, stools soft but stable — I'd recommend Protexin Pro-Kolin Advanced. It's a paste rather than a powder, which means dosing is precise and it works fast. It contains Enterococcus faecium (a clinically studied strain for dogs), kaolin to help firm stools directly, and pectin for gut wall support. It's not just a general probiotic — it's specifically designed for exactly this kind of digestive disruption. Give it once daily for five to seven days alongside the transition and you should see stools firming within two or three days. Hold the transition at 60/40 while you use it, then push to 80% new food once stools normalise. It's widely available on Amazon UK and straightforward to administer — most dogs take it without any fuss.
That sounds really sensible. Should I be worried if it doesn't firm up even with that, or is there a point where I should call the vet?
inparticular.ai
If stools haven't firmed meaningfully within five days of using Pro-Kolin, yes — call your vet. At that point it's worth ruling out a low-grade infection, a parasite like Giardia, or an intolerance to an ingredient in the new food itself. The same applies if he becomes lethargic, goes off his food, you see any mucus or blood, or if the stools become genuinely watery. None of those are likely given what you've described, but they're clear signals to stop waiting and get eyes on him. For most dogs in your situation though, Pro-Kolin plus a brief pause in the transition is all it takes.
Perfect, that's exactly what I needed. I'll grab the Pro-Kolin today.
inparticular.ai
Good plan. Stick with the 60/40 mix for now, use the Pro-Kolin for the full five to seven days even if stools firm up quickly, then continue the transition slowly once he's settled. Vizslas are sensitive but resilient — he should be fully onto the new food without any drama within a fortnight. Good luck with him.
