I Used FortiFlora for 7 Months. Here Are 3 Things I Wish I'd Known Before I Started.
If your dog is on FortiFlora, or your vet just told you to buy it, I need you to read this before you place your next order.
I'm not going to tell you FortiFlora is poison.
I'm not going to bash your vet.
FortiFlora does what it says it does.
It's a probiotic.
But when I started reading about why my dog's soft stools and diarrhea kept coming back even though I'd been using it every single day…
I found three gaps in the formula that explained everything.
Including why it works at first and then, for a lot of dogs, quietly stops.
9 minutes. That's all reading this takes.
You'll never look at that foil packet the same way.
The first box came from my vet's front desk.
Rosie, my Goldendoodle, had been dealing with soft stools for weeks.
Not the scary, rush-to-the-emergency-vet kind.
The other kind.
The kind where you're standing outside at 6am in your pajamas watching your dog strain over something that looks like soft serve, wondering if this is just her life now.
I'd already tried the usual stuff.
Pumpkin.
Boiled chicken and rice for a week.
Plain yogurt.
I even did the bone broth thing someone online swore by.
Nothing stuck for more than a day or two.
So when the vet said FortiFlora, I didn't ask questions.
I didn't read the label.
She's the vet. That was enough for me.
For about six weeks, it was a lifesaver.
Four days in, Rosie's stools firmed up.
I remember the relief…
Not just seeing it, but feeling it in my chest.
No more 3am trips outside.
No more inspecting every pile like it was a science experiment.
No more holding my breath every time she squatted.
I texted my husband a photo of a solid stool and typed "FINALLY" with three exclamation marks.
That's the kind of person I'd become.
Someone who celebrates poop.
If you're reading this, you understand.
I ordered a 30-count box on Chewy that night.
Set up Autoship.
Moved on with my life.
Then it started creeping back.
Not all at once.
That's the thing nobody warns you about.
It's not like FortiFlora just stops working one morning.
It's slower than that.
A soft stool here.
A mushy one there.
One week it's perfect.
The next week it's borderline.
By month three, I was back in that gray zone…
Not bad enough to call the vet, not good enough to stop worrying.
I started second-guessing everything I fed her.
I started inspecting piles again.
I started setting my alarm early again just in case.
I kept sprinkling.
Another month.
Another box.
Another $31.
Because what else was I supposed to do?
My vet said to use it.
Fourteen thousand Chewy reviews said it worked.
People were calling it "magic dust".
So why wasn't it magic anymore?
There had to be something I was missing.
Seven months. $217 in Autoship orders. And I'd never once questioned what was in that packet.
So I dug into FortiFlora's formula.
Liver flavor. Yeast. And a single strain of bacteria.
That's it.
That's what I'd been sprinkling on Rosie's food every morning for seven months.
That's what fourteen thousand people were calling magic dust.
If that were enough, it wouldn't have stopped working.
And that's what I couldn't get past.
Maybe it wasn't about what was in the formula.
Maybe it was about what wasn't.
That night I came across an article from a veterinary researcher that stopped me mid-scroll.
She was saying something I'd never considered.
That soft stools and diarrhea aren't the problem.
They're the symptom.
The signal that something deeper is going on inside the gut…
Something a probiotic like FortiFlora alone isn't designed to fix.
And that's when the three things I'd been missing for seven months finally clicked.
Her name was Dr. Nora Kestler. And she wasn't selling anything.
Veterinary microbiologist. She spent over a decade researching the canine gut.
No product link. No discount code. No brand partnership. Just honest research.
And she was explaining something most vets don't have time to get into during a 15-minute appointment.
What's actually happening inside your dog's gut when you give them a probiotic like FortiFlora…
And why, for a lot of dogs, it's not enough.
She started by asking one question…
"Do you know what FortiFlora actually does once your dog swallows it?"
I didn't. Not really.
I knew it was a probiotic.
I knew it helped with digestion.
But what it's actually doing inside my dog's body?
No idea.
Here's what Dr. Kestler explained.
Every morning, you tear open that foil packet.
You sprinkle it on your dog's food.
Your dog eats it.
And for a few hours, maybe a day, the bacteria inside that packet do their job.
They crowd out some of the bad stuff and firm things up.
Then they're gone.
Not dead.
Not hiding.
Gone.
Passed through the gut and out the other end.
So the next morning, you sprinkle again.
And the bacteria from yesterday?
Already gone.
Every single packet is replacing the last one.
Not building on it.
Replacing it.
That's when Dr. Kestler said something I haven't been able to stop thinking about.
"You've been filling a bucket with a hole in the bottom."
But that's what confused me.
If the bacteria pass through every day, fine.
That's how it works.
I can live with refilling the bucket every morning.
But it DID help.
For six weeks, it helped.
The bacteria were passing through the whole time…
And Rosie's stools were still firm.
So why did it stop?
If the bacteria are doing the same thing every day…
Why did it work in month one and not in month five?
That's when Dr. Kestler explained the second thing.
And this changed how I think about my dog's gut completely.
The bacteria wasn't the problem. What they were landing on was.
Dr. Kestler said to picture this.
Your dog has a raw patch on their skin.
That angry, red, irritated skin that shows up out of nowhere.
You know exactly what to do.
You clean it.
You put ointment on it.
You cover it.
Maybe your dog wears the cone for a few days.
And it heals.
Because you can see it.
Reach it.
Treat it directly.
Now imagine that same raw patch…
But on the inside of your dog's gut.
You can't see it. You can't reach it. You can't rub anything on it.
All you can do is sprinkle powder on your dog's food and hope the bacteria help on their way through.
That's what FortiFlora is doing.
Sending bacteria past a wound it can't treat.
- ✓ You can see it
- ✓ You can reach it
- ✓ You can put ointment on it
- ✓ It heals.
- ✕ You can't see it
- ✕ You can't reach it
- ✕ Powder passes over it
- ✕ Nothing in the formula heals.
In month one, the wound was small.
The bacteria could still do their one job while passing through.
By month five, the wound was worse.
The bacteria was passing through a gut that was too damaged to use them.
Same powder. Bigger wound.
And FortiFlora doesn't have anything that heals the wound from the inside.
Not one ingredient.
That was the second thing.
But the third thing is what made me cancel my Autoship.
Dr. Kestler called it "The Loop."
I emailed her: "Okay, Rosie's gut is damaged.
But can't the body just heal it?"
She replied: "Think about what's been happening to Rosie every day for the last seven months."
Soft stools.
Passing through a gut that's already damaged.
The soft stools are making the damage worse.
Every mushy pile in the yard.
Every 3am trip outside.
Every morning you're holding your breath while your dog squats.
That's the gut wound getting worse.
The soft stools irritate the damaged lining.
The damaged lining causes more soft stools.
The soft stools damage the lining more.
Over and over.
Day after day.
Month after month.
Every packet of FortiFlora I sprinkled was trying to firm things up on top.
But underneath, the cycle was still running.
Still tearing the lining apart.
Still making the wound bigger.
The thing I was desperately trying to fix was the same thing making it worse.
And I had no idea.
I cancelled my Autoship that night.
I sat in bed staring at the ceiling.
Rosie shifted next to me in her sleep.
Her stomach gurgled.
She deserved better than a bucket with a hole in it.
So I went looking for something that could actually help her.
Not just another probiotic.
Not another powder that adds bacteria and hopes for the best.
Something that plugs the bucket. Reaches the wound. And stops the loop.
THEN adds bacteria that actually have a chance to stay.
-
01
Plugs the bucket. Bacteria that survive, with food to keep them alive.
-
02
Reaches the wound. Ingredients that actually rebuild the gut lining.
-
03
Stops the loop. Calms the cycle that keeps tearing the lining open.
Everything I found was just another version of FortiFlora.
Different brand. Same idea. Bacteria in a packet.
Then I came across something different.
It was a liquid. Not a powder. Not a chew.
And when I looked at the formula, it looked nothing like FortiFlora.
Because it wasn't just a probiotic.
It's called Gut+.
I looked at the formula the way Dr. Kestler had taught me.
Not just what's in it. But what each ingredient is there to DO.
And for the first time, I was looking at something that addressed all three.
It plugs the bucket.
FortiFlora has one strain of bacteria.
No food for it.
Gone by morning.
Gut+ has seven.
Their website broke down what each strain does.
Some crowd out bad bacteria.
Some support the gut wall.
Some help with immune function.
But, one of them stood out.
Bacillus coagulans.
A soil-based strain that forms a protective shell around itself so it actually survives stomach acid.
I thought, sure.
Every brand says their stuff works.
So I looked for the proof.
They linked it.
A published study showing a 70% survival rate through stomach acid.
Then I noticed something else in the formula I didn't recognize.
A prebiotic called Chicory root.
I had to look up what a prebiotic even was.
Turns out, bacteria need food.
Just like anything alive.
If they show up to the gut with nothing to eat, they starve.
They pass through.
They leave.
FortiFlora drops bacteria into the gut hungry.
Gut+ feeds them on arrival.
Their website linked to the research on it.
Fifty clinical trials.
All showing it helps good bacteria survive and stay in the gut instead of washing out.
But plugging the bucket was only part of it…
It also stops the loop.
The soft stools were making the gut worse.
The worse gut was causing more soft stools.
FortiFlora has nothing that stops it.
Gut+ has turmeric.
I actually laughed when I saw that.
Turmeric?
I put that in my smoothies.
But this isn't the stuff from your spice rack.
It's a concentrated extract.
Four times stronger.
Made for your dog's gut specifically.
I looked it up. There's real research behind it.
It calms the thing that keeps tearing the wound open.
The body's overreaction.
The reason the gut can't heal on its own.
Then I saw another ingredient I didn't recognize.
PEA.
I had to Google it.
Turns out it's something dogs' bodies already make on their own to calm themselves down.
Gut+ just gives them more of it.
Their website linked a study on it too.
So the gut isn't just getting bacteria anymore.
It's getting something that tells the body to stop making the damage worse.
For the first time, something was actually working against the loop.
But Rosie's gut was still damaged.
The loop may stop.
But the wound doesn't just disappear.
And for the first time, Gut+ actually reaches the wound.
This was the thing FortiFlora never even attempted.
Gut+ has two ingredients that aren't in FortiFlora.
That weren't in any other probiotic I found.
L-Glutamine and fish collagen.
I looked them both up.
L-Glutamine is fuel.
It's what the cells inside your dog's gut run on to repair themselves.
This is what they need to rebuild.
Their website linked a study published in a journal literally called Gut.
It showed L-Glutamine helped rebuild the gut wall in nearly 80% of cases.
Eighty percent.
Fish collagen is the other ingredient.
It's the protein that seals the gut wall back together.
Think of L-Glutamine as the fuel and collagen as the building material.
Their website linked that research too.
These aren't bacteria.
They're not probiotics.
They're the ointment. The thing nobody told me Rosie's gut actually needed.
So I ordered it.
30-day money-back guaranteeHere's what happened with Rosie.
I didn't order it because of a coupon code or a flashy ad.
I ordered it because the formula just made sense.
Every ingredient mapped to a problem I now understood.
First morning, I filled the dropper, dosed it by Rosie's weight, and squeezed it over her food.
She licked the bowl clean.
Then I waited.
-
Days 1–5Nothing dramatic. I kept reminding myself — the damage didn't happen overnight. It's not healing overnight.

-
Week 2Stools started firming up. Consistently. Not one good day, one bad day. Just firmer. Every morning.
-
Week 4Still firm. No gray zone. No borderline. Just solid.
-
Week 6 — the week FortiFlora stopped workingI texted my husband. No photo this time. Just: "Week six. Still solid." He wrote back: "So it's actually working?" I didn't want to jinx it.
-
Month 2I stopped inspecting piles. Didn't even realize I'd stopped until one morning I just picked up and tossed the bag without looking. Just a normal walk with my dog.
-
Month 3Rosie had more energy. Her coat looked different. She was eating with enthusiasm again instead of picking at her bowl. Something underneath was changing. Not just the stools. Her.

-
Month 4 and beyondI'm still using it. Not because I'm afraid to stop. Because my dog is healthy. Not managed. Not "good enough." Not gray zone. Healthy. For the first time in over a year… I stopped thinking about my dog's poop.
30-day money-back guaranteeI started telling people.
I couldn't help it.
Every time someone in a Facebook group about dog health posted about FortiFlora…
"Is anyone else's dog still having soft stools on this?"
I'd comment what happened with Rosie.
And I'm not the only one.
"I genuinely thought soft stools were just Bear's thing. Like that was just him. My vet never seemed concerned, my mom kept saying 'some dogs are just like that.' I've been using gut+ for about 6 weeks and I feel so stupid for accepting it for as long as I did. Firm every single morning. I didn't even know his poops COULD look like this 😭💛"
"Murphy is a rescue and his stomach has been a disaster since the day we got him. I won't even tell you what we've spent at the vet because it's embarrassing. I was fully ready to just manage it forever. A woman in my adoption group told me to try gut+ and I almost didn't because I was so burned out on trying things. Two months in and his stools are normal. Like actually normal. I keep waiting for it to stop working and it hasn't 🐾"
"If your dog has gas that makes you apologize to house guests you understand my life with Duchess 😩 I honestly just thought pitties were like that. Nope. Apparently her gut was just a mess. Been on gut+ for maybe 7 weeks and the smell is basically gone?? She's also not scooting anymore which I didn't even connect to her stomach. I don't know what's in this stuff but it's doing something right 🍷"
"Two dogs. Two completely different stomach problems. One thing that actually worked for both of them. The dropper makes dosing so easy — my yorkie gets her amount, my boston gets his. No more guessing. Both sleeping through the night. Both firm. I keep recommending this to everyone at the dog park and they probably think I'm insane but I don't care 🙌"
30-day money-back guaranteeFortiFlora costs $31. Gut+ costs $39.99.
But that's not the real comparison.
My husband gave me the look when I told him.
The "you're buying ANOTHER thing for this dog" look.
So I showed him the math.
- 1 strain of bacteria
- No prebiotic / no food for the strain
- No gut repair ingredients
- No anti-inflammatory support
- Gone by morning
- 7 strains of bacteria
- Prebiotic (chicory inulin)
- Gut repair (L-Glutamine + fish collagen)
- Anti-inflammatory (turmeric extract + PEA)
- By-weight dropper dosing
FortiFlora: $31 a month.
For seven months.
That's $217 for something that stopped working by month three.
But that wasn't all I was spending.
Pumpkin every week.
Bone broth.
Yogurt.
The chicken and rice resets every time things flared up.
Add it all up and I was spending way more than $40 a month trying to manage a problem that wasn't getting fixed.
Gut+ is $39.99.
That's $1.33 a day.
FortiFlora was $1.03 a day.
For one strain.
No food for the probiotic bacteria.
No gut repair.
No inflammation support.
Gone by morning.
Thirty cents more a day.
That's the difference between a formula that visits the gut and one that actually fixes it.
My husband looked at the math for about ten seconds and said "just order it."
He never gave me that look again.
30-day money-back guaranteeAnd if Gut+ doesn't work for you…
They have a 30-day money-back guarantee.
Think about Rosie's timeline.
Day 5, stools started firming up.
Week 2, consistent.
Week 4, solid.
All of that happened inside 30 days.
You'll know if it's working before the guarantee even expires.
I didn't need it.
But the night I ordered, that's what got me to stop overthinking and just try it.
30-day money-back guaranteeYou have two options right now.
You can close this page and keep doing what you've been doing.
If that's FortiFlora, you already know how that went for me.
If you haven't started yet, now you know what you'd be starting.
Either way…
Another month of hoping.
Another month of wondering.
Another month of not knowing if tomorrow morning is going to be solid or soft serve.
Or you can try something that actually addresses what's going on inside your dog's gut.
With a 30-day guarantee that means you lose nothing if it doesn't work.
I'm not telling you what to do.
I'm telling you what I wish I'd done seven months sooner.
30-day money-back guaranteeBefore I ordered, I had the same questions you probably have right now.
"But my vet recommended FortiFlora. Am I going against her advice?"
No. You're not replacing a medication. You're upgrading a supplement. FortiFlora is a probiotic your vet recommended because it's what's available. gut+ is also a probiotic — it just does three things FortiFlora doesn't. Your vet wanted your dog's gut to get better. That hasn't changed. You're still doing what she asked. Just with a more complete formula.
"What if it stops working like FortiFlora did?"
That's what I was most afraid of. But the reason FortiFlora fades is because it never addresses the wound or the loop. It just adds bacteria that pass through. gut+ is designed to repair the surface and calm the cycle while adding bacteria. The fade happened because the gut was getting worse underneath. gut+ is the first thing I've used that actually works on the underneath.
"Why can't I just get it on Chewy?"
I asked the same thing. gut+ is only available through their website. At first that bothered me. Then I thought about it — it needs to be refrigerated after opening. It's dosed by weight, not a one-size-fits-all packet. This isn't the kind of product that sits on a warehouse shelf between thousands of other supplements. It's shipped direct because it has to be.
"Do I stop FortiFlora first or use both?"
I just switched. Cancelled my Autoship, started gut+ the next morning. There's nothing in FortiFlora that conflicts with gut+, so if you wanted to overlap for a few days while you finish your last box, that's fine too. But I didn't see the point in continuing something that wasn't working.
"My dog is on medication from the vet. Is gut+ safe alongside it?"
I'd check with your vet. Seriously. gut+ is a supplement, not a medication, and everything in it is food-based. But if your dog is on metronidazole or prednisone or anything prescription, your vet should know what you're adding. That's not me being cautious. That's just being a good dog mom.
30-day money-back guaranteeYour dog can't Google this for themselves.
They can't read labels.
They can't compare formulas.
They can't cancel an Autoship that isn't working.
They just eat what you put in their bowl and trust you to figure the rest out.
Rosie trusted me for seven months while I sprinkled powder on a wound I didn't know was there.
I wish I'd known sooner.
Now you do.
30-day money-back guaranteeRosie is asleep on her bed right now. Normal poop. Normal energy. Normal dog. I haven't thought about her stomach in months. Your dog deserves that too.
References
- Jäger R, Purpura M, Farmer S, Cash HA, Keller D. (2018). "Probiotic Bacillus coagulans GBI-30, 6086 Improves Protein Absorption and Utilization." Probiotics and Antimicrobial Proteins, 10(4), 611–615. DOI: 10.1007/s12602-017-9354-y
- Nagy DU, Sándor-Bajusz KA, Bóczán J, et al. (2023). "Effect of chicory-derived inulin-type fructans on abundance of Bifidobacterium and on bowel function: a systematic review with meta-analyses." Critical Reviews in Food Science and Nutrition, 63(24), 7242–7257.
- Hanai H, Iida T, Takeuchi K, et al. (2006). "Curcumin Maintenance Therapy for Ulcerative Colitis: Randomized, Multicenter, Double-Blind, Placebo-Controlled Trial." Clinical Gastroenterology and Hepatology, 4(12), 1502–1506.
- Couch DG, Tasker C, Theophilidou E, Lund JN, O'Sullivan SE. (2019). "Cannabidiol and palmitoylethanolamide are anti-inflammatory in the acutely inflamed human colon." Clinical Science, 133(18), 2159–2173.
- Zhou Q, Verne ML, Fields JZ, Lefante JJ, Basra S, Salameh H, Verne GN. (2019). "Randomised placebo-controlled trial of dietary glutamine supplements for postinfectious irritable bowel syndrome." Gut, 68(6), 996–1002. DOI: 10.1136/gutjnl-2017-315136
- Chen Q, Chen O, Martins IM, et al. (2017). "Collagen peptides ameliorate intestinal epithelial barrier dysfunction in immunostimulatory Caco-2 cell monolayers via enhancing tight junctions." Food & Function, 8(3), 1144–1151.