Samoyed gut slowness with hypothyroidism

Hypothyroidism slowing your Samoyed's gut is actually a really common secondary effect — reduced thyroid hormone affects the whole digestive tract, not just metabolism, and it can make probiotics both more useful and trickier to get right. Probiotics can make a genuine difference for dogs in this situation, 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 symptoms are you seeing day to day — constipation, loose stools, bloating, something else? And is the hypothyroidism currently managed with levothyroxine, or purely through diet?

That's really helpful context — and it sounds like your vet is taking a sensible, stepwise approach. The picture you're describing is classic hypothyroid gut slowness: reduced motility means food moves through more slowly, water gets reabsorbed, and stools end up hard and difficult to pass. A probiotic alone won't fix motility, but the right one can meaningfully support the environment the gut is working in. One thing worth knowing: grain-free diets are sometimes lower in fermentable fibre than dogs with slow guts actually need, which can compound the problem. Before I suggest a specific product — is she on any supplements already, and roughly how much does she weigh?

Perfect — a clean slate makes this straightforward. For a dog with her profile, I'd go with Protexin Pro-Kolin Advanced. It's a paste-format probiotic and prebiotic combination that contains Enterococcus faecium (a well-studied strain for gut motility support), kaolin to help regulate stool consistency, and pectin as a gentle prebiotic fibre source. That combination matters here: you're not just trying to shift bacterial balance, you're trying to add a mild source of fermentable fibre that a grain-free diet may be missing, while also helping firm up and regularise the stool texture. It's palatable, the dosing is by weight so at 28kg you'll be in a clear range, and it's widely recommended by UK vets for exactly this kind of sluggish gut presentation. It won't interact with dietary management and is safe to use alongside levothyroxine if she moves onto that later. Give it a consistent 4–6 weeks before judging it — motility changes are slow to show.

For this situation, the paste format is genuinely preferable — and it's not just convenience. Pro-Kolin Advanced in paste form combines the probiotic strains with kaolin and pectin in a way that acts directly in the gut as it moves through. Capsule-format probiotics typically focus purely on bacterial strains and don't include those stool-regulating components. For a dog with hard, dry stools and slow transit, that kaolin-pectin element is doing real work. If she were just dealing with occasional loose stools or a course of antibiotics, capsules would be fine — but for chronic gut slowness secondary to hypothyroidism, the full Pro-Kolin Advanced paste is the better fit.

I'd start with Pro-Kolin alone for the first two to three weeks and see how she responds — adding multiple variables at once makes it hard to know what's working. If you're still seeing straining after that settling-in period, a small amount of plain canned pumpkin (not pie filling — just pure pumpkin) stirred into meals is one of the gentlest, safest fibre additions you can make for a dog on a restricted diet. It's high in soluble fibre, adds moisture, and most dogs take to it easily. But give the probiotic a proper run first. And do loop your vet in at the next check — if motility doesn't improve with dietary support, they may want to revisit the thyroid management sooner rather than later.