Variety in, variety grows.
Boost™ brings 18 Fermented Superfoods, and Youthful Grasses & Sprouts™ adds seven young greens. In a study with people, a diet rich in fermented foods increased gut microbe diversity.
Formulated with Dr. Ian Billinghurst
Shop by concern · Itchy skin & paw licking
The licking you hear at 2 a.m.
Skin is what you can see. The gut is what you can't. Here's an inside-out routine that works alongside your vet.
- 14,500+ Happy Customers
- 18 fermented superfoods
- 30-Day Taste Guarantee
You've tried a lot. That's not failure.
The wipes, the cone, the shampoo that smells like oatmeal. The food switches. A few rounds at the vet. And still: lick, lick, lick.
If you're reading this at midnight, you're not alone. Most owners who land here have already done more than most. What's often missing isn't another product for the skin. It's support for the gut underneath it.
Sound familiar?
- Paw licking or chewing
- Scratching that wakes you up
- A dull coat or flaky skin
- Tummy trouble on the side
Why the gut shows up on the skin
A large part of your dog's immune system sits along the gut wall, right next to the microbes living there. Researchers call the connection between gut and skin the gut-skin axis: a gut that's inflamed or out of balance can show up as irritated, reactive skin.
Studies have found that dogs with itchy skin tend to have a different mix of gut microbes than dogs without it. Skin also takes weeks to turn over, so this is a patient project that works alongside flea control and your vet, not instead of them.
Where to start
Your starting point
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Step 1
Boost™
Ground it.
Why it helps here: A large share of the immune system sits along the gut wall, right next to the microbes living there. Boost™ feeds those microbes with 18 fermented superfoods, kale, broccoli, blueberry, turmeric and milk thistle among them, and fermentation makes the nutrients skin and coat rely on easier to absorb.
Start low and build to 1 tsp per 20 lb.
See Boost™ → -
Step 2 · with Boost™
Youthful Grasses & Sprouts™
Optimize it.
Why it helps here: Young wheatgrass, barley grass, oat grass and alfalfa grass, plus broccoli, alfalfa and cabbage sprouts: chlorophyll-rich variety, fermented. Used with Boost™, more kinds of plants in the bowl means more kinds of microbes fed, and the broccoli sprouts bring sulforaphane.
Add it in week 3, 1 tsp per 20 lb.
See Youthful Grasses & Sprouts → -
After 90 days
Sustain™ + Youthful Grasses & Sprouts™
Root it and keep the variety coming.
Why it helps here: Skin turns over in weeks, and the gut community shifts over months. Sustain™ keeps the inside-out support going after the Reset, with Youthful Grasses & Sprouts™ alongside it.
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.
A quarter dose, building to the full teaspoon per 20 lb. Take photos of the paws and belly now; skin changes are slow and you will want the comparison.
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Weeks 3–6 · Boost™ + Youthful Grasses & Sprouts™.
Full dose, and the young greens go in. Stools usually settle first; the licking may not have changed yet, and that is normal.
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Weeks 7–12 · Skin renews.
Skin turns over about every month, so this is when owners start to see calmer paws, fewer 2 a.m. licking sessions and a coat that looks better in the sun.
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Day 90 · Compare the photos.
Put your week-one photos next to today. Many owners move to Sustain™ to keep the inside-out support going, and keep Youthful Grasses & Sprouts™ in the bowl.
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? Skin renews in weeks and the gut community shifts over months, so the licking is usually the last thing to change. Judge it at day 90, with your week-one photos beside you.
4.8
14,500+ Happy Customers
Turn your dog's itchy skin 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
Skin takes 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 Youthful Grasses & Sprouts™ as the add-on for skin and coat.
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
Created by fermentation.
Two weeks of fermentation creates probiotics and postbiotics, the compounds microbes make that the body can use.
Absorb what you already feed.
Fermentation breaks down plant cell walls first, so the nutrients skin and coat rely on are easier to absorb.
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 co-developed Boost™ to feed the gut garden. Skin and coat are two of the signs owners watch most closely.
Meet Dr. Billinghurst →Questions
Common questions
Does this replace my vet's plan?
No. Gussy's Gut® is a food supplement that supports the gut. Keep working with your vet, and add it alongside.
How long before I see a difference?
We ask for 90 days. Skin and coat change slowly, and every dog is different. Take a photo on day one so you have something to compare.
Why add Youthful Grasses & Sprouts™?
Variety. Four young grasses and three sprouts, sprouted and fermented, on top of what Boost™ brings.
Can I keep using shampoos and wipes?
Yes. Nothing here conflicts with them.
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 →
Work on the part you can't see.
Boost™ plus Youthful Grasses & Sprouts™, every day, for 90 days.
