Skip to content
PLEASE NOTE: You may experience errors on our site when using Internet Explorer. Please consider updating your browser, or download Google Chrome.

SmartFlex® Senior Pellets

From: Price: $ $ $ $ $ $ $ $ $ ($/day) ($/day) $ $ $ ($/day) Member Price
(AutoShip discount will be reflected in your cart)
Packaging Options:
Shipping Frequency: AutoShips every 28 days (details) AutoShips every  days (details) One-time Ship
You'll love our AutoShip because it's:
  • Focused on healthy s, because consistency is key
  • Easy to snooze or cancel online, anytime
  • Totally flexible - edit your order as often as you'd like
  • Your VIP pass to FREE SmartPerks benefits
PLUS! You'll save % on every shipment if you order this product on AutoShip PLUS! You'll save % on every shipment if you order this product on AutoShip
The frequency you selected is not eligible for SmartPerks benefits that come with AutoShip supplement orders. In order to get benefits like free shipping and 10% off, set this product to ship at least every days. What are SmartPerks?
These are for:
    Cups:    ( Cups / Meal)
Change Dose
Feeding Chart

Daily Serving

Dog Weight - lbs Inactive Dog Active Dog Working Dog
Inactive Dog - Less than 30 minutes of vigorous exercise daily
Active Dog - At least 30 minutes of vigorous exercise daily
Working Dog - More than two hours of vigorous exercise daily
This is only a guide. Please consult your veterinarian to determine the perfect feeding amount for your dog.
  • This horse already has an existing AutoShip SmartPak. Please select the "AutoShip" checkbox or enter a different horse name.
Please call 1-800-461-8898 to order this product.

Choose AutoShip to become eligible to apply for the FREE Colicare Program after checkout.

You're eligible to apply for our FREE ColiCare Program after checkout.

New ship same day!
Order within and have it by Shipping to
Add these items to your cart to get your estimated arrival date. Shipping to
Lowest Price Guaranteed
We're bringing you this product at the lowest price allowed by the manufacturer so you won't find it cheaper anywhere else. This also means we can't apply any further discounts or promotions.

Product Overview

Which horses benefit from senior joint support?

Normal aging and years of work can really take a toll on joints, causing stiffness and discomfort that can make a senior horse’s life more difficult. By providing your old friend with joint support designed to help keep him comfortable, you’re showing him how much you love him and appreciate the years you’ve shared. 

Learn More

Product Image

Key Ingredients


Supplement Facts

Ingredient Name Amount Per Serving
Ingredient Name Amount Per Pound

Ingredient Details


Weight Recommended Amount Loading Amount

How the Ingredients Work



Supporting Success

Supercharge Your Supplements

  • Choose Your Flex: SmartFlex® Senior
    Not sure which SmartFlex® formula is the best one for you? Watch this short video & see if SmartFlex Senior is right for you and your horse.
  • Simplify with SmartPaks | Consistent, Custom, Convenient
    Simplify your life with SmartPaks: custom-made, pre-measured daily doses of your horse's supplements.


The reviews provided on this website represent the experience of the individual posting the review. We do not adopt, edit, or endorse any of the submissions posted within the reviews section. Rather, the reviews are part of an online community of animal owners that desire to share their particular experience with other individuals. These reviews are not a substitute for discussing the health of your animal with a veterinarian.

SmartPak customers are some of the most conscientious animal owners around. We encourage you to share your experience with the products we sell to help fellow customers to make informed choices for their animals. We do not edit these reviews in any way - they are direct customer-to-customer communication. We do monitor reviews for positive and negative feedback, and use this feedback to improve our selection as well as sharing feedback with product manufacturers to help them improve their products. Please note that we recommend consulting your vet with serious health issues.

SmartFlex® Senior Pellets is rated 4.7 out of 5 by 1598.
Rated 5 out of 5 by from See the results with this product! My 24 year old OTTB had been slowing down, he was on MSM since that is what I had in the barn, and you could tell he still wasn't feeling great between his arthritis and the bone spur on the back of his knee. Cantering wasn't happening at all and trotting was only happening in short bursts. After being on SmartFlex Senior for 2 1/2 months, he is feeling 100Xs better! I rode him for the first time since starting SmartFlex Senior (bad weather here has prevented it before now). He trotted as long as I wanted and cantered on his own multiple times for longer stretches than I ever expected - even breaking into the canter when my daughter popped on for a quick ride after she rode her pony. To say I'm pleased is an understatement - I'm tickled to death to have my old guy feeling so good again!
Date published: 2022-04-05
Rated 5 out of 5 by from
Date published: 2022-03-28
Rated 5 out of 5 by from Really works! I have my 27 year old retired gelding on this and I started my 9 year old barrel mare on this a month ago and wow at the difference in a short amount of time! The length of her stride and her movement improved dramatically. I’m very happy with this for both horses. Highly recommend!
Date published: 2022-03-28
Rated 5 out of 5 by from These saved my gelding I began feeding these to my old gelding (he’s about 28) about a year and a half ago. They have completely changed his life. We were talking about retiring him and needing take him out of the field because he was struggling so much to walk but after about 3 weeks of these I began to see major improvement. He has arthritis in his front legs and the swelling has decreased in both of them. He went from barely being able to walk to rearing up and kicking down stall doors when he’s mad. I cannot recommend these enough. After seeing the great results my horse has, three other horses at my barn are trying these. I cannot say enough good things about these supplements.
Date published: 2022-02-15
Rated 5 out of 5 by from Horses love it My horses are picky and when I introduced this to them they ate it with no fuss!
Date published: 2022-02-11
Rated 5 out of 5 by from Great product! I put my 23 year old mare on this and she is showing much more energy and overall wellness, and seems to not be as stiff in her movements. That is very promising as she has been showing her age previously. She has only been on this product for a little over a month and am already seeing promising results.
Date published: 2022-01-26
Rated 5 out of 5 by from Great supplement, I noticed a big change My 13yo OTTB gelding has been on this for about a month. He's arthritic (average what you'd expect for a teenage OTTB in full work), and he has mild KS. I had read elsewhere that devil's claw was a good ingredient for mild pain associated with KS, plus I liked that this has all of the standard joint supplement ingredients. It's affordable and palatable. My horse is a semi picky eater, he's funny about strong smells or a large amount of powder. This is pelleted and doesn't have a strong smell at all. He didn't even notice it in his grain. I noticed a difference within a week or so. My horse tends to get tense, anxious, and hollow in cold weather due to discomfort, and he became a lot more relaxed, soft, and elastic after being on this. I am combining this with a separate dose of pure MSM for the winter months, which has helped him even more. The only downside of this supplement is that it's not USEF legal. If you're not showing, it's definitely worth trying! That is the only reason I switched to something else.
Date published: 2022-01-04
Rated 5 out of 5 by from Great product for maintenance of senior horses I use this supplement for all of my senior horses as a part of their regular support care. I do find that it seems to make them more comfortable. My pony is a bit of a picky eater and he happily scarfs this down.
Date published: 2021-12-27
Rated 5 out of 5 by from Improved Comfort!!!! I have been using this product for over a year now for 2 of my horses. My 24yr old morgan has always had a gimp at a trot in his later years, but last year it was noticeable while riding so I started him on it and it improved so much. This summer I upped his dosage, because why not and my family noticed he does NOT limp anymore even while riding. My 20yr old QH has had leg problems due to confirmation problems since he was young, but was never lame. We noticed a change a year and a half ago that his weird stance started to become more normal. Last year his hind legs when weight was placed on them they would pop (to go into the normal weight-bearing position) and even I could feel it while riding him. I placed him on these supplements and in the span of a week he was my normal riding, jerk of a horse. Even this year he felt great during the summer and it made me so happy. This product is a lifesaver.
Date published: 2021-12-15
Rated 5 out of 5 by from Improving my horses comfort! I started my 20 year old gelding on this supplement a little over a month ago and within 2 weeks, I was seeing improvement. My horse has struggled with on again, off again lameness for the past two years particularly in the winter months. This past summer, his lameness was recurrent despite warmer weather. I truly feel like the joint support along with Yucca and Devil's Claw are helping ease that inflammation and keeping him more comfortable as the weather changes. I know I will need to wait a full 4 months or so before I can definitively say it has made a difference, but I'm already seeing improvement! Grateful to have found this product and how easy SmartPaks make it for me to make sure I always have it on hand and to dispense! My horse gobbles it!
Date published: 2021-12-06
Rated 5 out of 5 by from Love it! We have our four on it. One has bad arthritis and you can tell this helps alleviate the pain he’s felt. They’ll all eat it without grain and we’ve got some picky eaters!
Date published: 2021-10-20
Rated 5 out of 5 by from Gleaming coat and youthful gait We are pleased with the results we see in our older mares (ages 18 - 32). They are maintaining appropriate weight, moving freely, have glossy coats, are energetic, and are holding their youthful vitality. We love SmartFlex Senior Pellets!
Date published: 2021-08-25
Rated 5 out of 5 by from loosening joints! cricket came to me , unknown age...mature skinny, spine and hip bones showing very little activity except Grazing! She is stiff in front right ankle and both hocks. she was overused and not fed much. so on a good feeding program and asked smartpak for help choosing something to make her comfortable. we have been on Flex senior pellets for two months and Cricket is blossoming. a friend said she glows now! never rushes to the barn but is definitely using all her joints! cant wait to see what the next two months will look like! Thank you!!
Date published: 2021-08-25
Rated 5 out of 5 by from Lameness gone!! My gelding has had off and on lameness for years, vet said laminitic(mechanical, not dietary), but he was consistent with heel pain. After two months on this supplement (with yucca saponin as well) he is sound!!! Acting much more like himself and trotting out in pasture again!! This supplement has CHANGED HIS LIFE and given him another chance. Thank you smartpak!!
Date published: 2021-08-07
Rated 4 out of 5 by from On our second month, Jazzie seems to have more energy and is happier going to keep giving him the Smart Pak
Date published: 2021-07-19
Rated 5 out of 5 by from This stuff worked for my 30 yo gelding! I bought this supplement because I needed something for my 30 year old gelding that would come out of the stall sore and stiff. I wanted something that would make him feel better. After about a month, I noticed a big difference in him! He now walks out of the stall without any stiffness or soreness! He also is much more active when he is in the pasture! Smartflex Senior has been a lifesaver for my horse Pepper!
Date published: 2021-07-05
Rated 5 out of 5 by from Makes my old horse feel great! My 24 y/o horse has been on Smartflex Senior Pellets for about three months now and I can feel a big difference. He is less creaky and more willing to work. He has also been consistently sound. I highly recommend this supplement for any horses in work!
Date published: 2021-07-03
Rated 5 out of 5 by from Truly Helps Using for a 17yo quarter horse with neck and hock arthritis, and tendonitis of front left DDFT. Horse has gone from lame and going into retirement at age of 15 to sound and happily working several days a week! I tried several different joint supplements before this one, and wish I hadn't wasted my time. The horse is a bit of a picky eater, but eats this stuff right up with or without grain. He will be on this for the rest of his life. Thank you SmartPak for yet another great supplement!
Date published: 2021-07-02
Rated 4 out of 5 by from It seems to be helping! I bought this product a month ago and it seems to be helping, so I now bought the same product in the largest size container that was available from SmartPak.
Date published: 2021-06-16
Rated 5 out of 5 by from Fecal Water Syndrome It really has helped our aged Haflinger, with Fecal Water Syndrome. No longer has a nasty tail!!!! Yahoo!
Date published: 2021-06-03
Rated 5 out of 5 by from This product has many things in it needed for main My senior horse has several health issues but I saw an improvement in him after a few weeks of taking it.
Date published: 2021-05-24
Rated 5 out of 5 by from Senior pellets help I have been using the Senior Pellets for a month now and my horse is showing some improvement in joint function. I am going to continue with them and hope she continues to improve.
Date published: 2021-05-07
Rated 5 out of 5 by from Works great This supplement makes a world of difference for my senior arthritic mare. With out she goes dead lame in a day. Highly recommend. Good bang for your buck too.
Date published: 2021-03-24
Rated 5 out of 5 by from Picky Eater Loves!!! I started my senior TB on this at the start of winter when I noticed him significantly slowing down. We would ride for 30 minutes before he would start moving normally and if he stood for any amount of time he was instantly stiff as a board in his legs and would have to start over in the warm up process. Now he kicks up in the field and has more life than some of the young horses on the property. He loves the taste and will beg for it. He eats it out of my hand by itself which is very unlike him. Definitely keeping him on it!
Date published: 2021-03-06
Rated 5 out of 5 by from Happy older horse My friend gave me some Smart paks from her horse that went to heaven for my 25 year old lesson horse. TSugar Coated is moving better now and her stiffles are not sore, so now she is a Smart Pak Regular!!!
Date published: 2021-02-26
Rated 5 out of 5 by from Works great!! I use smart flex sr pellets for my mare and she has been on them since july it took a while but she is doing great
Date published: 2021-02-14
Rated 5 out of 5 by from It works for one one of mine!! Have a very well used schooling horse who is up in age. Has some stiffle issues . We tried to corrective shoe him that did not work. Vet recommended that we put him on the SmartFlex Senior pellets as it has the highest MSM Content. Within a month we could see a difference and three months later we are sound! He will remain on this product! Thanks smart pack!
Date published: 2021-01-07
Rated 5 out of 5 by from Very impressed My 25 year old TB has been there, done that! I have had him since he was 9! He raced until he was 7, and we had done jumpers, upper level dressage, and eventing through training level before being diagnosed with thoroughpin in late 2013 which led me to the decision to retire from eventing. His hocks would swell which would resolve in sweat wraps day after day. He would then become more stiff as the years went on. I had him on many joint supplements with very little result. It became very frustrating because I couldn't help my superstar be more comfortable. As time went on, I noticed a decline in his activity and his spirit. Even being 24 at the time I did not consider him a senior because his mind is as though he is still my 9 year old! I have been using smartpak for years and stumbled across this supplement in August. It seemed to offer all of the things I was looking to help make my guy comfortable. And let me tell you, I have never seen such great results like I have with this supplement. He is no longer stiff, his hocks RARELY swell. His overall attitude is happier! Our vet (who has been our vet for 16 years) still cannot believe that he is 25 this year! He does not look it, or act it. This is the happiest and best I have seen him in YEARS! We love our trail rides and have ventured out more in the fall of 2020 than ever before. Our last adventure was a hard 9 miles with many hills, and he was still going strong at the end of our ride. The group we were with couldn't believe how well we kept up nor could they believe he was a 25 year old been there done that retired racehorse and eventer! 10/10 recommend this product to anyone. Give this product a few months (I suggest 3-4) to really notice the difference. He is an EXTREMELY picky eater and I have had no issues with him taking this supplement!
Date published: 2021-01-06
Rated 5 out of 5 by from Tasty! I bought this a month ago. It seems to help my horse move easier.
Date published: 2021-01-04
Rated 5 out of 5 by from Smart Pak Senior Pellets Thank you SmartPak for making giving these hoof supplements to my senior equine beautiful Grullo horse easy. I can’t say enough good things. Simple, clean and exact.
Date published: 2020-12-30
  • y_2023, m_5, d_29, h_23
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.35
  • cp_2, bvpage2n
  • co_hasreviews, tv_211, tr_1387
  • loc_en_US, sid_15240, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_smartpak
  • bvseo_sdk, net_sdk,
  • CLOUD, getContent, 78ms


Recently Viewed View all

Qualifying Items

Qualifying items are eligible for free shipping, every day. Look for the badge below on the product page to confirm that your item ships free!
Free Shipping

Ride Along Items

Ride Along items are eligible for free shipping when shipped with your next AutoShip order or any qualifying item. Look for the badge below to identify a Ride Along item.
Ride Along Item Ships free with a qualifying item.