Fermentation sweetens vegetables.
Two weeks of fermentation makes vegetables slightly sweeter, which is part of why most dogs take to Boost™.
Formulated with Dr. Ian Billinghurst
Shop by concern · Picky eater
Sniff. Stare. Walk away.
If your dog inspects every bowl, here's how owners get a teaspoon of Boost™ past the inspector.
- 14,500+ Happy Customers
- 18 fermented superfoods
- 30-Day Taste Guarantee
From our blog: Picky Eaters and the Gut: When Fussiness Is a Signal →
You've bought things they never touched.
There's a drawer somewhere with half a bag of something they refused. You stand over the bowl and coax. You add chicken. You add more chicken.
So the last thing you want is another powder they'll ignore. Fair. Here's what's worked for the pickiest dogs our customers have.
Sound familiar?
- Walks away from anything new
- Eats only with a topper
- Skips breakfast
- Gets bored of the same bowl
Why some dogs are fussy
A lot of fussiness comes down to smell, texture and routine, and some of it is learned: a household that keeps upgrading the menu teaches a dog to hold out. Some is a real gut signal. A dog with an unsettled stomach often loses interest in food, so fussiness that comes and goes with soft stool or gurgling is worth taking seriously.
The line that matters is between fussy and unwell. A dog who has always been particular but is thriving is one thing; a sudden change in appetite, especially with weight loss or vomiting, is a prompt vet visit. For the ordinary picky dog, a steady routine and a settled gut do more than a rotating buffet.
Where to start
Your starting point
-
Step 1
Try Boost™ 3 oz.
Why it helps here: Fermentation makes vegetables slightly sweeter and gives them a savory, broth-like smell most dogs go straight for. One small pack is enough to find out, and the Taste Guarantee covers it.
39 teaspoons, one pack, covered by the 30-Day Taste Guarantee. A quarter dose in a topper they love.
See Boost™ → -
Step 2
The 90-Day Reset.
Why it helps here: Once the bowl comes back clean, the full-size bag is the better price per teaspoon and the right size for the 90-Day Reset. An unsettled gut often loses interest in food; 18 fermented superfoods, fed every day, settle it.
Once the bowl comes back clean, move to the 7.5 oz plan sized to your dog.
See Boost™ → -
After 90 days
Sustain™
Why it helps here: Same fermented foundation, everyday price, so the bowl stays interesting after the Reset.
See Sustain™ →
What to expect over 90 days
Every dog is different. If you see blood in the stool, stop and call your vet.
-
Weeks 1–2 · Ease in.
¼ tsp in a stinky topper. Move up only after two clean bowls in a row. Fermented food is slightly sweet and smells like broth, which is why most inspectors pass it.
-
Weeks 3–6 · Full dose, every day.
Keep the routine steady and the menu the same. Most owners see the bowl come back clean more often as the gut settles.
-
Weeks 7–12 · Appetite settles.
With the gut steadier, mealtime stops being a negotiation for most dogs. Keep notes on appetite, stool and energy.
-
Day 90 · Look back, then decide.
Compare with week one. Many owners move to Sustain™ to keep the bowl interesting at the everyday price.
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.
-
Coat
Lindsay "It's been life changing"
-
Itching
Diana "Healthy gut microbiome equals healthy skin microbiome"
-
Poop Eating
Veronica "Her poop eating has definitely decreased"
-
Energy Levels
Becky "Her energy levels are crazy!"
-
energy levels
Tracey "He was happier, his entire demenour changed"
-
Stool Quality
David "I immediately noticed stronger consistency with stool quality"
-
Stool Quality
Dana "His poop is consistently good"
-
Grass Eating
Emma "She hasn't eaten grass in months now"
-
Grass Eating
Lauren "I gave it a week and they stopped eating grass"
-
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 settled gut is what brings appetite back and keeps it there. Give it the full 90 before you judge it.
4.8
14,500+ Happy Customers
Turn your dog's picky eating 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
Once the bowl comes back clean, this is the plan. Tell us the weight and we'll send the right number of 7.5 oz bags of Boost™ for 90 days, every 90 days. Not sure yet? The 3 oz pack and the 30-Day Taste Guarantee are there for that.
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
Hide it in something stinky.
Fish oil, tuna water, plain yogurt, kefir or coconut milk. Mix a quarter dose in with a splash of water.
Covered if they say no.
New customer and your dog won't eat it? Your first pack is refundable, shipping included, within 30 days of delivery, as long as at least half is left.
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
Boost™ was formulated with Dr. Billinghurst to go over any food, every day.
Meet Dr. Billinghurst →Questions
Common questions
It smells strong. Will my dog eat it?
Fermented food has a smell, and most dogs love it. For the fussiest, start tiny and mix it into something even stronger.
How does the Taste Guarantee work?
If you're a new customer and your dog won't eat it, the first package you buy gets a no-questions-asked refund, including shipping. Return it within 30 days of delivery with at least 50% left. If your first order has several packs, only one can be returned, so start with one.
Read the full guarantee →
Can I sprinkle it on dry?
No. Always mix it with food and a little liquid so it can't be inhaled.
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 →
