Fermented for two weeks.
Boost™'s 18 Fermented Superfoods are broken down before they reach the bowl. Fermentation creates probiotics and postbiotics and makes the food easier to absorb.
Formulated with Dr. Ian Billinghurst
Shop by concern · Loose or mushy stools
The yard tells you everything.
Soft, unpredictable stools are the gut's daily report. Here's where owners start, one teaspoon at a time.
- 14,500+ Happy Customers
- 18 fermented superfoods
- 30-Day Taste Guarantee
You check every morning. We get it.
Some days it's fine. Then it's soft again, and you're back to wondering what he got into. You've tried pumpkin. You've tried chicken and rice. Maybe a probiotic from the vet's shelf. It helped for a week, then it didn't.
None of that means you did anything wrong. It usually means the gut needs more than one ingredient can give it.
Sound familiar?
- Stools that change from day to day
- Pick-ups that need a second bag
- Gurgling before breakfast
- A probiotic that "kind of" worked
Why stools go soft
Firm stool means the gut is doing two jobs well: breaking food down and handling water. Both depend on the microbes living there and the fiber they're fed. A big share of stool quality comes down to what you feed the bacteria, not just what you feed the dog.
When the microbe community is thin, or the bowl is short on the right fiber, food moves through without being fully used. Well-fed microbes turn fiber into the short-chain fatty acids that feed the colon lining and help it handle water, and fiber gives the stool something to hold on to.
Where to start
Your starting point
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Step 1
Boost™
Ground it.
Why it helps here: Loose stools usually mean a gut lining that's irritated and handling water badly. Boost™ starts with the detox and gut-lining work: 18 superfoods, fermented for two weeks so they're easy to absorb, with prebiotic fibers that feed the microbes that calm and firm the gut lining. A firmer lining handles water the way it should, and that's what firms up stools.
¼ tsp to start, building to 1 tsp per 20 lb.
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Step 2 · with Boost™
Fiber & Fortifier™
Work the soil.
Why it helps here: Pumpkin, apple fiber and chicory root give stool structure: soluble fiber holds water, insoluble fiber adds bulk. Used with Boost™, it's the fastest way to see a difference in the yard, and you tune the amount to what you see.
Add it in week 3. Start at 1 tsp per 20 lb and adjust up to 1 tbsp until stools look the way you want.
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Add to Boost™
Youthful Grasses & Sprouts™
Optimize it.
Why it helps here: Adds seven unique ingredients to the Boost™ formula for added benefits: wheatgrass, barley grass, oat grass and alfalfa grass, plus broccoli, alfalfa and cabbage sprouts, all fermented. Used with Boost™, it brings the young greens and extra plant variety a settling gut can use.
Add it in week 3, 1 tsp per 20 lb, alongside Boost™.
What to expect over 90 days
Every dog is different. If you see blood in the stool, stop and call your vet.
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Weeks 1–2 · Easing in.
A quarter dose, building up slowly. Stools may still be soft and you may not see results yet; this is the gut adjusting, not the verdict. If you ever see blood, stop and call your vet.
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Weeks 3–6 · The first firm days.
Full dose of Boost™, and Fiber & Fortifier™ goes in. Most owners start counting firm days now: two to four a week is typical at this stage.
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Weeks 7–12 · More firm than not.
Three to four firm days a week, then more. Pickups get easier, and the morning check stops being a guess.
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Day 90 · Regular.
Compare with week one. For most dogs the yard is regular now. Keep Boost™ going with Fiber & Fortifier™, and add Youthful Grasses & Sprouts™ for more variety.
Real dogs, real results
How it's helped other dogs
Reviews from owners who started where you are, straight from our review app. We've opened it on this concern; pick All to read everything.
Browse by topic
No reviews on this one yet.
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Coat
Lindsay "It's been life changing"
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Itching
Diana "Healthy gut microbiome equals healthy skin microbiome"
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Poop Eating
Veronica "Her poop eating has definitely decreased"
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Energy Levels
Becky "Her energy levels are crazy!"
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energy levels
Tracey "He was happier, his entire demenour changed"
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Stool Quality
David "I immediately noticed stronger consistency with stool quality"
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Stool Quality
Dana "His poop is consistently good"
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Grass Eating
Emma "She hasn't eaten grass in months now"
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Grass Eating
Lauren "I gave it a week and they stopped eating grass"
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Itching
Theresa "She's not scratching anymore!"
Formulated with Dr. Ian Billinghurst, B.V.Sc.Veterinary surgeon · Creator of the B.A.R.F. diet · Author of four books on natural pet nutrition
Why 90 days? Stools are usually the first thing to shift, often inside the first month. The full 90 is what makes it stick, so judge it at day 90, not day 10.
14,500+ Happy Customers
Turn your dog's loose stools around
Your dog's 90-Day Gut Reset
Boost™ sized to your dog's weight, delivered every 90 days.
- 18 Fermented Superfoods
- 100-Day Guarantee
Firm stools take a season, not a weekend. Tell us the weight and we'll send the right number of 7.5 oz bags of Boost™ for 90 days, every 90 days, with Fiber & Fortifier™ as the add-on that gives stool its structure.
We ask for 90 consistent days before you judge it. If you're not willing to give it 90 days, this may not be right for you.
GutAbles® treats
Reward them, and treat their gut between meals.
Every reward is a chance to keep the gut going. GutAbles® are one animal protein, a blend of Gussy's Gut® fermented organic superfoods and organic Manuka honey, dehydrated and never cooked, baked or extruded.
They work alongside the powder in the bowl, so the gut support carries on between meals, one treat at a time.
- Dehydrated, never baked
- One protein + fermented superfoods
- Organic Manuka honey
- For dogs
Awarded the 2025/2026 Treat List by Susan Thixton. See the list
How Gussy's helps
The science, in plain words
Food for the good microbes.
Sunchoke inulin and dandelion root are just two of some of the best prebiotic fibers in our formulas. Gut microbes turn fibers like these into short-chain fatty acids, which the cells lining the gut use for fuel.
Structure, from whole food.
Fiber & Fortifier™ adds 13 organic whole foods, including pumpkin, apple fiber and chicory root. You adjust the dose to your dog.
Read the research
These studies explain the mechanisms. None of them tested Gussy's Gut® products.
Our Chief Veterinary Advisor & Formulator
Dr. Ian Billinghurst
“This is the single most important upgrade to dog food in over 25 years.”
Dr. Ian Billinghurst, Chief Veterinary Advisor & Formulator
- Veterinary surgeon
- Creator of the B.A.R.F. diet
- Author of four books on natural pet nutrition
- Founder of the Billinghurst Institute
- Decades of species-appropriate nutrition work
Dr. Billinghurst has spent decades on what dogs evolved to eat. Fermented plants were part of it. Boost™ puts them back in the bowl.
Meet Dr. Billinghurst →Questions
Common questions
Isn't this just another probiotic?
No. Probiotics add a few lab-grown strains. Boost™ is whole vegetables, greens and herbs, fermented for two weeks. Fermentation creates probiotics and postbiotics, and the plants bring prebiotic fiber. It works on the whole garden, not a few seeds.
Why Fiber & Fortifier™ instead of pumpkin?
It covers pumpkin, apple fiber and chicory root in one scoop, plus 10 other organic whole foods. No buying, opening and portioning four things.
Can stools get softer at first?
Sometimes, in the first week or two. That's why we start at a quarter dose. If it happens, go back a step and build up more slowly.
How much Fiber & Fortifier™?
Start at 1 tsp per 20 lb. Some dogs do best closer to 1 tbsp per 20 lb. Adjust a little at a time.
Does firmer stool help with scooting?
Firmer stools press on the anal glands as they pass, which is how the glands empty naturally. More fiber means firmer stools. If your dog scoots often, talk to your vet too.
How do I give it?
Mix about 1 teaspoon per 20 lb of body weight into your dog's food with a splash of water, once a day. Never serve the powder dry. Start with a quarter of the dose and build up over one to two weeks. Don't cook it; heat breaks down what fermentation built.
What if my dog won't eat it?
Stir it into something they love with a strong smell, like fish oil, tuna water, plain yogurt, kefir or coconut milk. If they still won't eat it, the 30-Day Taste Guarantee covers your first pack (see below).
What's the 30-Day Taste Guarantee?
If you're a new customer and your dog won't eat it, the first package you buy of any product gets a no-questions-asked refund, including shipping. Return it within 30 days of delivery with at least 50% still in the package. If your first order has more than one pack, only one pack can be returned, so we suggest starting with one.
Read the full guarantee →
Better mornings in the yard start in the bowl.
Boost™ sized to your dog for 90 days, with Fiber & Fortifier™ as the add-on.
