Keep the bowl familiar.
Don't change everything at once. Boost™ goes over the food they already eat.
Formulated with Dr. Ian Billinghurst
Shop by concern · Rescue or new dog
New home. New food. New everything.
The first weeks are a lot for a dog's gut. Here's a gentle place to start.
- 14,500+ Happy Customers
- 18 fermented superfoods
- 30-Day Taste Guarantee
From our blog: Puppy Gut Health: Starting Off on the Right Paw →
You want to get this right.
The new bed. The new leash. Advice from the shelter, the breeder, your neighbor and the internet. And somewhere in week one, the stress poops.
It's normal. Everything in their world just changed, including the bowl. A gentle, familiar start helps.
Sound familiar?
- Soft stools since coming home
- Just finished a course of medication
- Nervous, unsettled eating
- Unsure which food to keep them on
Why transitions hit the gut
A dog's gut bacteria specialize to the food they've been fed. Swap everything overnight, add a move and a new routine, and those microbes are suddenly working with unfamiliar material, which shows up as gas, soft stool or a skipped meal while they adjust. Many shelter dogs also get antibiotics before adoption, and studies in dogs show those change gut microbes for weeks afterward.
The fix is a gradual handover: mostly old food and a little new, shifting the ratio over about a week, with the gut well fed through the change. A resilient gut is the quiet advantage behind every smooth transition.
You don't know where their gut has been.
We often don't know where rescue dogs came from or what their past was like. They may have had multiple vaccinations, multiple rounds of antibiotics, multiple infections or parasites, and they may have eaten out of trash cans if they were stray for a while. We see this across the rescue dog population, so you don't know where their gut is at.
The best thing for a rescue dog is a gut reset: 90 days of fermented whole foods, started gently, over the food they already eat. It feeds the gut garden that antibiotics and a hard start may have thinned out, and it gives you a baseline you can trust.
Where to start
Your starting point
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Step 1
Boost™
Ground it.
Why it helps here: A move, a new food and a new routine all land on the gut at once, often on top of antibiotics and a rough start. Boost™ goes over whatever they're eating now: 18 fermented superfoods that feed the gut garden back up, without one more change.
¼ tsp in their current food, building to 1 tsp per 20 lb.
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Still soft after a month? · with Boost™
Fiber & Fortifier™
Work the soil.
Why it helps here: Pumpkin, apple fiber and chicory root add the structure stool needs. Used with Boost™, you adjust the amount until the yard looks right.
Add it in week 4. Start at 1 tsp per 20 lb.
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After 90 days
Sustain™
Root it.
Why it helps here: Once your new dog is settled, Sustain™ keeps the fermented foundation going at the everyday price.
See Sustain™ →
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 · Ease in.
Keep everything else the same. One change at a time: Boost™ at a quarter dose over their current food, building up slowly.
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Weeks 3–6 · Full dose, every day.
The stress poops usually settle first. Keep notes on stool, appetite and energy; a rescue rarely comes with a history, so you are writing the first one.
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Weeks 7–12 · The garden fills back in.
Antibiotics and a hard start thin the gut community; fermented food every day feeds it back up. This is when owners see a steadier dog: coat, energy, appetite.
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Day 90 · Now you know where their gut is.
Compare with week one. You finally have a baseline. Many owners move to Sustain™ to keep things going.
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? A rescue's gut has often been through a lot before you met. A full season of fermented food is how you find out where it really is.
14,500+ Happy Customers
Turn your rescue dog's gut 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
Tell us the weight and we'll send the right number of 7.5 oz bags of Boost™ for 90 days, every 90 days. It goes over whatever they're eating now, so the gut gets support without one more change.
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
Variety for a gut in transition.
18 Fermented Superfoods. Fermentation creates probiotics and postbiotics, and the plants bring prebiotic fiber.
Start tiny.
A quarter dose for the first days, building over two weeks while everything else settles.
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
Rob met Dr. Billinghurst in 2000, when he wanted to raw-feed his first Lab, Buddy. Twenty-plus years later, they built Boost™ together.
Meet Dr. Billinghurst →Questions
Common questions
Should I wait until they settle?
You can start right away at a quarter dose, as long as the rest of the bowl stays familiar.
They just finished antibiotics. Is now a good time?
It's one of the most common times owners start Boost™. Follow your vet's instructions first.
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 →
