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Fastrack Probiotic Pack

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Feeding Chart

Daily Serving

Feeding Chart
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.
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Only SmartPaks on AutoShip make you eligible to apply for the FREE ColiCare Program. Colicare is a free program that provides up to $15,000 in colic surgery reimbursement
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Product Overview

Maintains a balanced digestive tract

Fastrack Probiotic Pack contains beneficial bacteria, yeast culture, enzymes, and fructooligosaccharides (FOS) to enhance digestive tract and horse health. The unique combination of ingredients enhance nutrient absorption, encourage the growth of fiber-digesting bacteria, stabilize digestive tract pH, and provide FOS to selectively feed the two most desirable species of health-promoting bacteria.

  • Includes beneficial bacteria, yeast culture, enzymes & fructooligosaccharides (FOS)
  • Supports the digestive tract by encouraging nutrient absorption & growth of fiber-digesting bacteria

Learn More

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

  • Simplify with SmartPaks | Consistent, Custom, Convenient
    We take the guesswork out of serving sizes, ensuring your horse gets the right amount, every time. SmartPaks have airtight seals to ensure that your horse always has the freshest supplements available. Your horse is unique and his supplements should be too. Choose from over 230 supplements to get everything he needs, nothing he doesn't. We print your horse's name on every Pak so there are no mix-ups, making feeding time fast, accurate and easy! Unlike most buckets, SmartPaks are made from recycled plastic and can be recycled again! We'll send your SmartPaks on time so you never run out, with total flexibility and no commitment. Plus all SmartPaks over $40 receive free ground shipping.


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.

Fastrack Probiotic Pack is rated 4.9 out of 5 by 23.
Rated 5 out of 5 by from So Far So Good for Digestive Health! My horse had some digestive concerns this past fall as the weather fluctuated between summer and winter temperatures. After having my veterinarian out for an exam, we determined that it would be a good idea to start my horse on a digestive supplement to support his hindgut. I decided to give Fastrack Probiotic Pack a try to provide him with ingredients to help stabilize his digestive tract and encourage healthy bacteria growth in his gut. My horse can be a picky eater, so starting him on a new supplement is always a bit nerve wracking just to see if he will eat it. I've had no issues with the palatability of this supplement; it smells great and my horse has been licking his dish clean! My horse has been getting Fastrack for about a month, and I have not had any further issues with his hindgut or digestion.
Date published: 2022-03-07
Rated 2 out of 5 by from Did not help Bought for a horse with a month's-long diarrhea problem. she is not sick, just has unexplained diarrhea. This product did not help at all. Waste of money.
Date published: 2021-11-23
Rated 5 out of 5 by from High Quality Probiotic This summer I moved my mare to a facility that had very different feed and turnout. I added Fastrack and G.U.T. once per day to feed and she had a seamless transition. Will continue Fastrack, as recommended by my herbalist.
Date published: 2019-09-05
Rated 5 out of 5 by from Great stuff I have used this probiotic for about a year now, and my ulcer-prone horse is doing better than ever. I also have him on the Succeed, but found he did even better when I added this. Not too expensive, and he eats it with no problem, and he's a picky eater.
Date published: 2018-02-17
Rated 5 out of 5 by from It works! Our two horses have been on Fastrack for about five years now. It is really good stuff that does everything that it claims. Keeps that gut moving!
Date published: 2017-03-18
Rated 5 out of 5 by from Helped digestion a lot! I've been using this for about a month on a horse with loose manure and absorption problems. He's really flourished and poop is back to normal. I like this digestion product the best!
Date published: 2016-04-18
Rated 5 out of 5 by from I have been giving my horses this product for about 2 years now and I haven't had any problem with colic since.
Date published: 2014-11-13
Rated 5 out of 5 by from i like product and think it is makimg a difference
Date published: 2013-09-04
Rated 5 out of 5 by from Awesome stuff! I tried this on my ulcer-prone mare, hoping it would help with her digestion. I had tried quite a few other probiotics (at least four), none seemed to make much of a difference. I could tell within days this one was helping her tremendously and now I've put my other horses on this. This is the best pre/probiotic out there, and I think it would benefit every horse. If people can only afford one supplement, I think it should be this one.
Date published: 2013-04-14
Rated 5 out of 5 by from Made my horse look AWESOME My horse looked like an abuse case for the first 3 years that I had him. I had him tested for a number of things, but everything came back negative. I put him a ton of different supplements, but nothing really put weight on him. Tried putting him on rice bran pellets, different feeds. He gets hay 3x a day and is on grass so he was getting plenty of forage. Grained 2x a day. No idea what was up. Right now he is on the same grain he's always been on, the same feed plan. But he gets chia, cocosoya ultra SP and this stuff. My friend who has a 26yr old QH who looks like he's 14 recommended it to me. I truly think this has made all the difference on my hard keeper!
Date published: 2012-06-10
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