How Much Probiotic to Give a Dog by Weight in Ontario: MOJO Pet Supplements Dosage Chart and What CFU Counts Mean

Most healthy adult dogs do well on 1–5 billion CFU per day under 25 lbs, 5–10 billion CFU at 25–60 lbs, and 10–20 billion CFU over 60 lbs, given with food. Dogs recovering from antibiotics or loose stool often need the higher end for 2–4 weeks. Always confirm dosing with your veterinarian first, then browse dog health and wellness supplements to match the strain and format.

That range isn't arbitrary — it reflects the doses used in most published canine feeding trials. Below you'll find a weight-by-weight chart, an explanation of what a CFU count on a label actually guarantees, and how MOJO Pet Supplements blends compare to the other digestive supplements we stock for dogs.

Probiotic dosage for dogs by weight in Canada: the numbers behind the chart

Canine probiotic dosing is measured in colony-forming units (CFU), not milligrams, because you're counting live organisms rather than a chemical compound. Published canine trials typically use 1–10 billion CFU daily, and clinical protocols for acute diarrhea have gone as high as 20–45 billion CFU per day in large dogs for short periods.

Here's the practical weight chart our nutrition staff walk customers through at the counter:

• Under 10 lbs (4.5 kg) — 1–2 billion CFU daily; usually a 1/4 to 1/2 scoop of powder, roughly 0.5–1 g
• 10–25 lbs (4.5–11 kg) — 2–5 billion CFU daily; about 1 g of powder or one soft chew
• 25–50 lbs (11–23 kg) — 5–8 billion CFU daily; typically one full scoop, 2–3 g
• 50–80 lbs (23–36 kg) — 8–15 billion CFU daily; 3–4 g, often split between two meals
• Over 80 lbs (36 kg+) — 15–20 billion CFU daily; 4–6 g, always split across two feedings
• Post-antibiotic recovery (any size) — the upper end of the range for 14–28 days, dosed at least 2 hours apart from the antibiotic

Two things matter more than the raw number. First, strain specificity: Enterococcus faecium SF68 and Bifidobacterium animalis AHC7 have the strongest canine evidence base, and research indexed on NCBI/PubMed shows benefits are strain-dependent rather than a class effect. A product with 30 billion CFU of a strain never tested in dogs isn't automatically better than 5 billion CFU of one that has been. Second, viability at expiry: a reputable label states CFU guaranteed *through* the best-before date, not CFU at manufacture.

Regulatory context helps here. AAFCO maintains the list of recognized direct-fed microbial organisms and defines how they must be declared in the guaranteed analysis, and a 2026 revision continues to tighten label transparency for direct-fed microbials. Supplements themselves sit outside complete-diet nutritional adequacy statements, which is why a probiotic can't replace a food that meets AAFCO life-stage formulation requirements. The FDA Center for Veterinary Medicine treats most canine probiotics as feed ingredients rather than drugs, so manufacturers can't legally claim to treat or cure disease. A widely cited 2011 analysis of commercial veterinary probiotics found that a majority of products tested did not contain the organisms or CFU counts printed on the label — a reminder that third-party testing and Canadian manufacturing oversight are worth paying for.

In our store we see the same pattern every fall: dogs coming off a course of antibiotics after a scrape at Downsview Park, owners reporting soft stool for a week afterward, and a measurable improvement in stool quality once a targeted probiotic goes in alongside a consistent diet. Pet owners tell us the stool-scoring improvement usually shows up in 5–10 days, not overnight.

Related questions

How many CFU does a dog probiotic need to actually work?

A functional canine probiotic delivers at least 1 billion CFU per dose for small dogs and 5–10 billion CFU for medium to large dogs, of strains with documented canine research. CFU counts below 100 million are generally too low to survive gastric acid in meaningful numbers. Check that the CFU figure is guaranteed at expiry, not at manufacture.

Dose ceiling matters less than you'd think. Excess organisms simply pass through — probiotics are transient colonizers, which is exactly why daily consistency beats occasional mega-dosing. Enteric-coated capsules, microencapsulated powders, and freeze-dried formats all improve gastric survival; loose powders sprinkled on warm food lose viability fastest, so add them once the meal has cooled.

What is MOJO Pet Supplements probiotic for dogs used for?

MOJO Pet Supplements produces targeted canine supplement blends, including digestive support formulas that combine probiotic organisms with prebiotic fibre. Owners typically use them for dogs with intermittent soft stool, dietary transitions, travel stress, or post-antibiotic gut recovery. Dose by body weight as listed on the label and give with food.

What our staff like about the category is the pairing of probiotics with prebiotics — usually inulin or fructo-oligosaccharides at roughly 200–500 mg per serving. Prebiotics are fermentable fibre that feed the beneficial organisms already present; the combination is called a synbiotic. If your dog's current kibble already lists chicory root or beet pulp in the ingredient panel and shows 3–5% crude fibre in the guaranteed analysis, you're partway there and may only need a modest probiotic dose.

Can I give my dog a human probiotic instead?

It's not recommended. Human probiotic products use strains adapted to the human gut, often at doses far above canine ranges, and some contain xylitol, inulin blends, or flavourings unsuitable for dogs. The American Veterinary Medical Association and your own veterinarian are the right sources before substituting any human supplement.

Xylitol is the sharpest risk — the ASPCA lists it as acutely toxic to dogs, and it appears in many chewable human supplements. Read every inactive-ingredient line. Canadian-made canine formulas are simply the cleaner path.

How long does it take for probiotics to work in dogs?

Most owners see stool-consistency changes within 5–10 days of consistent daily dosing, with fuller benefit around 3–4 weeks. Acute diarrhea protocols can show improvement in 48–72 hours. If loose stool, vomiting, blood, or weight loss persists beyond 48 hours, stop guessing and see your veterinarian — probiotics don't treat parasites, pancreatitis, or obstruction.

Keep the rest of the diet stable during the trial period. Changing food, treats, and supplements in the same week makes it impossible to tell what helped. Our team suggests a 30-day single-variable trial: same food, same kcal per day, one new supplement.

Do puppies and senior dogs need different probiotic doses?

Dose by body weight, not by age — a 12 lb puppy and a 12 lb senior get similar CFU counts. What changes is context: puppies benefit during weaning and vaccination stress, while seniors often pair probiotics with joint support containing glucosamine and omega-3 fatty acids. Confirm suitability with your veterinarian for pregnant, immunocompromised, or medicated dogs.

Puppy nutrition has its own guardrails. AAFCO growth profiles require a minimum 22.5% protein content on a dry-matter basis for puppies versus 18% for adult maintenance, and 8.5% versus 5.5% minimum fat content. A probiotic doesn't change those requirements — it supports the gut that has to absorb them.

What to actually buy: matching format, strain and dose to your dog

The right purchase comes down to three decisions: powder versus chew, probiotic-only versus synbiotic blend, and whether you also need to fix the underlying diet. Powders let you dose precisely by weight; chews win on compliance for dogs that inspect their bowl.

When a customer comes in with a 70 lb shepherd on soft stool after antibiotics, our nutrition staff typically suggest a powder in the 10–15 billion CFU range split across two meals, plus a check of the current food's fibre content and protein source. Roughly a third of the time the food itself is the issue — a rich 32% protein formula fed at full portion to a dog burning far fewer kcal in a Toronto winter.

If the gut issue traces back to the food, fix that first. Limited-ingredient and single-protein diets from Zignature, SquarePet, or Go! Solutions reduce the number of variables a sensitive digestive tract has to manage; you'll find them across our dry dog food shelves. Dogs transitioning to a richer diet often do better easing in over 7–10 days, and adding a spoonful of gently formulated wet dog food improves hydration during that window. For dogs moving toward raw, our staff always pair the first bag with a probiotic — that transition is where we see the most short-term stool changes. Browse raw dog food in North York if that's the direction you're heading, and read our broader dog wellness guidance before stacking multiple supplements.

Treats count too. If your dog gets 6–8 biscuits a day, that can be 15% of daily kcal and enough to unsettle digestion on its own — our advice is to cap treats at 10% of total daily calories and choose single-ingredient options from our dog treats selection.

One more sourcing note: the Canadian Veterinary Medical Association encourages owners to discuss supplements with their vet rather than self-diagnosing chronic digestive signs, and we say the same thing at the counter every week. A supplement supports a plan; it isn't the plan.

Bottom line: Dose canine probiotics by weight — roughly 1–5 billion CFU under 25 lbs, 5–10 billion at 25–60 lbs, and 10–20 billion CFU above 60 lbs, given daily with food. Prioritize strains with canine research and CFU guaranteed at expiry over the biggest number on the front of the bag. Persistent digestive signs need a veterinary exam, not a bigger scoop.

You'll find us at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7 (open 7 AM to 11 PM daily); most GTA addresses can get same-day delivery through SkipTheDishes or a similar app.