Probiotic made dog's stools loose? Gentler alternatives

A probiotic that causes loose stools is unfortunately more common than the labels admit — many supplements pack in high bacterial counts that can tip a sensitive gut in the wrong direction, even when the intention is good. The good news is there are genuinely milder options that support digestion without overwhelming the system. To point you toward the right one: what were the loose stools like — short-lived or persistent throughout the course? And is your Border Terrier's digestion generally settled when he's not on supplements, or does he tend toward a sensitive stomach anyway?

That pattern makes a lot of sense. He's not a chronically sensitive dog — he just doesn't respond well to sudden changes or big bacterial hits. What you had was probably a high-CFU multi-strain probiotic, and for a dog like him, that's too much too fast. His gut flora reacted rather than benefited. What were you hoping the probiotic would help with — general maintenance, something specific like post-antibiotic recovery, or was it more of a 'just seemed like a good idea' purchase?

That's a very reasonable instinct — and for a dog like him, you don't need anything aggressive. I'd actually steer you away from high-strain probiotic capsules entirely and toward a prebiotic-led supplement instead. Prebiotics feed the good bacteria already in his gut rather than flooding it with new ones, which is a much gentler approach for a dog who's fundamentally healthy. The one I'd suggest is Lintbells YuMEGA Gut Health for Dogs. It's a powder you add to food, built around a prebiotic fibre blend plus a modest probiotic inclusion — the bacterial count is low enough that it won't destabilise a settled gut, but it provides real daily support. It's designed exactly for dogs who are in good health and you want to keep that way. Lintbells as a brand is well-regarded and the formulation is genuinely conservative, which is what you need here. Start with half the recommended dose for the first week just to ease him in, and you're very unlikely to see the loose stool issue repeat.

Yes — it's on Amazon UK, which is the easiest place to grab it, and it tends to be in stock reliably. You can also find it through Lintbells directly or in some independent pet shops. The powder format means it just goes over his normal food with no fuss, and most dogs accept it without any issue. Given he's generally healthy and you're doing this as maintenance rather than treatment, one tub will last a good while at the doses involved. That's really all you need.