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SmartPak SmartSupplements SmartFlex Senior Pellet Horse Joint Supplement, 3.7-lb bag

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About This Item

Details

  • This supplement provides comprehensive support for senior horses’ joints with glucosamine, chondroitin sulfate, and HA.
  • Each serving includes ingredients like devil’s claw and boswellia to address discomfort associated with aging.
  • This formula is suitable for both senior and adult horses in need of joint support.
  • The tasty pellet form with no added sugar is great for easy feeding, and you can feel good about giving it to your horse.
  • SmartFlex Senior can be fed with or without grain for added convenience.

Ingredient Information

Feeding Instructions

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Questions & Answers

1 Customer Questions

is this product safe for donkeys?

Answer by Chewy • Nov 16, 2025
This supplement is intended for horses.
Reviews
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4.6
Rated 4.6 out of 5 stars
24 Ratings
Terms & Conditions

16 Customer Reviews

Rated 5 out of 5 stars
Received Free Product
By Crtrluvr on Jul 9, 2026

Great supplement

I have to admit that I used to buy this quite often before it became Smartpak. Then I started using Chewy with free shipping and the chance to try many other joint

I have to admit that I used to buy this quite often before it became Smartpak. Then I started using Chewy with free shipping and the chance to try many other joint supplements to help my aging horses. I now have four seniors who are between 17-26, my riding horse is especially stiff and achy due to a shoulder injury from a snake bite. I started mixing my own from the usual MSM, glucosamine, chondroitin sulfate and DC and HA. But it gets very expensive and horses aren’t crazy about the taste. I’ve always appreciated the pellet form it seems to be more palatable. And that’s important to me, you certainly don’t want any waste! I gave up a lot of the brands I was happy with due to shipping and handling, so knock on wood Chewy continues their great customer service with fast free shipping! And is expanding their brands like Smartpak and others. I’ve always had faith in these products, I’m only on my second week but my big horse is already showing less pain. Try it

Rated 5 out of 5 stars
Received Free Product
By Penny on Jul 8, 2026

Noticeable difference in my 20 yr old horse!

I saw a noticeable difference in 30 days on my 20 yr old horse that has navicular. Just this morning he was striding out the pasture in a beautiful floaty trot

I saw a noticeable difference in 30 days on my 20 yr old horse that has navicular. Just this morning he was striding out the pasture in a beautiful floaty trot. It made my heart sing that he was no longer doing his tentative slow walk that he did prior to putting him on this. I was amazed! I love that I finally found something to help him that didn't break the bank and WORKS!!!

Rated 5 out of 5 stars
Received Free Product
By Sue McD on Jul 11, 2026

Good for Picky Eaters!

My horse is a very picker eater and not usually interested in supplements for more than a day or two. I have been giving him this SmartPak SmartFlex Senior supplement

My horse is a very picker eater and not usually interested in supplements for more than a day or two. I have been giving him this SmartPak SmartFlex Senior supplement for a week now, and he is still enjoying eating it. It will take some time to see if it helps with any of his "senior" symptoms, but at least he is giving it a chance!

Rated 5 out of 5 stars
Received Free Product
By HouseCat15 on Jul 8, 2026

SmartFlex Senior

I’ve had my senior thoroughbred on SmartFlex senior pellets for about 3 weeks. I feel his willing to move forward has improved. He seems less arthritic. He’s

I’ve had my senior thoroughbred on SmartFlex senior pellets for about 3 weeks. I feel his willing to move forward has improved. He seems less arthritic. He’s generally a picky eater and adding this to his feed didn’t change his eating habits. This product is a pellet with a serving scoop that’s approximated 2 tablespoons.

Rated 5 out of 5 stars
Received Free Product
By Apple on Jul 7, 2026

Smartflex Senior Pellets Supplement

I switched to Smartflex Senior Pellets Supplement for my 28 yr old quarter horse with osteoarthritis in his knees. I like the pellets instead of powder that I was

I switched to Smartflex Senior Pellets Supplement for my 28 yr old quarter horse with osteoarthritis in his knees. I like the pellets instead of powder that I was using. I also like that it is only one scoop per day. He eats it right up mixed in his grain. His mobility is showing improvement.

Rated 5 out of 5 stars
Received Free Product
By Detangler on Jun 11, 2026

Great joint product specifically for seniors.

Tried the SmartFlex Senior for my 29 year old horse. The pellets smell fresh and tasty. Only one scoop a day to feed. My horse wasn’t lame when I started her on

Tried the SmartFlex Senior for my 29 year old horse. The pellets smell fresh and tasty. Only one scoop a day to feed. My horse wasn’t lame when I started her on the product but have noticed a lot more pep in her step when she is cantering in for meals. My only wish was that it was soy free.

Rated 5 out of 5 stars
Received Free Product
By Marianne on Jun 12, 2026

The horses like SmartFlex Senior Pellet!

We decided to try this SmartFlex Senior Pellet for 2 horses that have some joint stiffness. It has been less than two weeks and we will continue to monitor their

We decided to try this SmartFlex Senior Pellet for 2 horses that have some joint stiffness. It has been less than two weeks and we will continue to monitor their mobility. The both seem to like it and eat it right up. That is important because eating it is the first most important part. I would like to follow up after a few more weeks with more results.

Rated 5 out of 5 stars
Received Free Product
By Maggies mom on Jun 8, 2026

Haven't started yet!

As usual, Chewy delivered in a big way! Another full sixe sample of horse supplements. Honestly, I have not tried the Smart Flex yet, since I began another joint

As usual, Chewy delivered in a big way! Another full sixe sample of horse supplements. Honestly, I have not tried the Smart Flex yet, since I began another joint supplement 2 days before it arrived. i have reviewed the ingredients and Smart Flex haas some good,dependable ingredients including boswelia for pain relief.

Rated 4 out of 5 stars
Received Free Product
By shank bone on Jul 10, 2026

Senior Flex

Pleasant tasting- horse eats in grain with no issue. Like the idea of natural anti-inflamatory ingredients. Just started using in past week so have not noticed any

Pleasant tasting- horse eats in grain with no issue. Like the idea of natural anti-inflamatory ingredients. Just started using in past week so have not noticed any drastic changes as of yet, but will give it at least two months. Easy to add into daily grain.

Rated 5 out of 5 stars
Received Free Product
By CritterMom on Jul 12, 2026

Easy to use, happily consumed!

I used this with all my "seniors". I was easy to use and they readily consumed it. Anything I can do to keep my seniors healthy, active, and strong--I'm in. SmartPak

I used this with all my "seniors". I was easy to use and they readily consumed it. Anything I can do to keep my seniors healthy, active, and strong--I'm in. SmartPak is a trusted brand and my guys thrived.