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As a canine enrichment expert and dog mom to a senior Labrador, I’m always on the lookout for new products that improve my pup’s quality of life. Plentum is an organic microbiome supplement for dogs that claims to support both gut and oral health.
I know there’s a strong gut-brain connection, so a healthy gut microbiome can support a better mood. Plentum also claims to help with bad breath, which is a nice bonus for my senior dog who has some plaque on his teeth.
I had a 10-day supply to try with my dog Burt, so this review is based on our short-term results. Usually, supplements like this need 3-6 weeks for the full effect. But even in the short window we had for this test, I noticed some changes worth sharing.
What Is Plentum and How Does It Work?
Plentum is a daily dog supplement in a convenient powder form. Each pre-portioned packet contains a blend of postbiotics and gut-supportive ingredients, including:
- Colostrum: For gut health and immune support
- Inulin: Prebiotic fiber that helps digestion
- Vitamin E and fish oil: Skin, coat, and inflammation support, which is perfect for senior dogs
I appreciate that the ingredients are clear and straightforward. I also love the emphasis on microbiome health.
Microbiome care means keeping the balance of good and bad microorganisms in your dog’s body. Supplements like Plentum are a great way to do that.
A healthy microbiome can lead to:
- Better digestion and nutrient absorption
- Less gas and less stinky dog farts!
- Fewer skin flare-ups or irritation
- Fresher breath and healthier gums
Trying Plentum With My Senior Dog
My senior Labrador, Burt, is 13 years old and still a healthy, happy guy. But he’s had a rough year. Seasonal allergies cropped up for the first time, and his sister, Lucy, crossed the rainbow bridge.
I was hopeful to see if a probiotic powder for dogs would give Burt a boost for his mind and body.
When my box of Plentum arrived, I appreciated the low-profile cardboard packaging. It was easy to store on the kitchen counter so I would remember to give it to Burt each day.
Each box has 30 single-serve packets. Since Burt weighs 85 pounds, the recommended dose is three packets a day, which works out to just over half a tablespoon of powder.
When I poured the powder into Burt’s breakfast, it didn’t have much of a smell at all. But when I added my usual splash of warm water to his food and mixed it in, the powder had a mild fishy smell.Burt’s reaction to Plentum in his food? Zero hesitation. (He is a Labrador, after all.)
Here’s what I noticed during our 10-day trial:
- Within five days, Burt’s mood seemed brighter. He’s been missing his sister for the last two months, so I really noticed a newfound pep in his step and a sparkle in his eye.
- No change in breath yet. That may take 2+ weeks to notice.
- Consistent poops and no stinky farts. This supplement didn’t upset his tummy.
According to Plentum’s website, in the first 2 weeks of giving this supplement, you might notice better energy, fresher breath, and improved gut health.
I can confirm the energy part! As for plaque and bad breath, I’d need more time to know for sure. If it truly disrupts oral biofilms (also known as plaque) by 98% over time, that would be a game changer.
If your main concern is bad breath, you might also like Petful’s article on why dogs get bad breath.
Pros and Cons of Plentum
Based on a 10 day trial of Plentum with my senior dog, here are the pros and cons:
Pros:
- Human-grade, clean ingredients. There are just nine listed on the label and they’re all recognizable and easy to pronounce.
- Gentle on the stomach and great for picky eaters because it doesn’t have any added flavor or artificial ingredients.
- Easy-to-mix powder that can be added to meals. Nothing to chew or swallow.
Includes postbiotics, which are proven to support microbiome health and help with skin issues and inflammation.
Cons:
- Premium price point, especially for large dogs who take a high dose
- Only available on Plentum’s website
- Some dogs may need a gradual introduction to new ingredients
Single-serve packets mean more packaging waste than a scoopable loose powder
Is It Safe and Backed by Research?
Plentum is made in the USA and vet-formulated, although no specific veterinarians are named.
According to their website, Plentum is NASC-compliant, which means it meets the National Animal Supplement Council’s quality standards.
There’s also research to back up the ingredients:
- A real-world study with Beagles showed that adding inulin (like the fiber in Plentum) plus a probiotic improved gut bacteria, boosted immune function, and supported better stool quality.
- As explained in this 2025 scientific review in Microorganisms, postbiotics (one of Plentum’s key ingredients) have been shown to help balance the microbiome, discourage harmful bacteria, and support immune health.
Where to Buy Plentum and How Much Does It Cost?
Plentum is only available through their brand website at plentum.com.
For my dog Burt’s size, a 30-day supply is $97.62, or $55.99 when you sign up for a monthly subscription.
For smaller dogs under 20 pounds, a 30-day supply is $34.99, or $29.99 with a subscription.
Curious to see how it works for your dog? You can use code FIRST15 for 15% off your first order.
If you’re shopping around for other microbiome care supplements, for comparison:
- Native Pet Probiotic costs about $29.99/month
- Purina FortiFlora costs $30.99/month
I’ve tried FortiFlora with Burt before in the hopes that it would improve his mood and help him feel less stressed. And honestly, 10 days of Plentum seemed to have more impact on his mood than several months on FortiFlora.
Final Verdict: Is Plentum Worth It?
For smaller dogs, Plentum could be a no-brainer daily supplement. For large dogs like Burt, the cost is a consideration.
That said, I love that it:
- Targets both gut and oral health
- Uses high-quality, simple ingredients
Showed a noticeable improvement in Burt’s mood in just 5 days
I’d like to try it for the full 6 weeks to see if there’s a difference in his plaque and breath.
Until then, I’d recommend it for senior dogs, immune support, and possibly for picky eaters.
As always, talk to your vet first before starting any new dog supplement.
FAQ
What is Plentum and how does it help dogs?
Plentum is a daily microbiome powder with prebiotics, postbiotics, and other nutrients that support digestion, oral health, and immune function.
Is Plentum safe for senior dogs?
Yes. It’s gentle, easy to mix with food, and includes immune-boosting ingredients that can be great for older pups.
How long does it take for Plentum to work?
Some dogs may show subtle improvements in mood or energy within 1–2 weeks, but full benefits can take 6 weeks to notice.
Can I mix Plentum with dry dog food?
Yes, but I recommend adding a little warm water so the powder blends evenly.
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