Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.7 Best Horse Weight Gainer | Calorie-Dense Weight Gain

Check Price on Amazon

Farnam Weight Builder sits at the top because it delivers the highest crude fat content — a full 50 percent — of any dry supplement in this lineup, which means you can feed less volume while providing more usable calories. The fat comes from heat-stabilized rice bran and flaxseed meal, giving you a guaranteed minimum of 4 percent omega-3 fatty acids to support both coat shine and joint health as your horse gains weight. Owners consistently report visible results within two to three weeks on hard keepers and seniors.

The powder format mixes easily into a regular grain ration without clumping, and the alfalfa flavor makes it palatable even for horses that turn their nose up at unfamiliar supplements. With no added sugar, this is a safe option for insulin-resistant equines or those prone to metabolic issues. The 7.5-pound bucket provides a full 30-day supply at the standard 4-ounce serving per day for one horse, making dosage tracking straightforward.

Customer feedback highlights especially strong results in horses over 20 years old that had struggled to maintain winter weight for multiple seasons. A consistent note in verified reviews is the improvement in body condition score alongside a noticeably glossier coat by the end of the first month. The only trade-off is that the powder can settle to the bottom of the bucket if not stirred after shipping, requiring a quick mix before serving.

Check Price on Amazon

Horse Guard Super Weight Gain combines full-fat extruded soybeans, a complete vitamin-mineral package, and digestive aids into a single granule formula designed for horses that need comprehensive support, not just calories. Extruded soy provides a dense protein and fat profile that helps rebuild topline muscle while the added probiotics and prebiotics support nutrient absorption in the hindgut. At 10 pounds per bag with a 4-ounce serving, each bag supplies approximately 20 servings for a 1,000-pound horse.

The 1,500 IU of Vitamin E per dose sets this apart from straight fat supplements — especially useful for senior horses or recovering animals whose immune systems need antioxidant support. Owners of ex-racehorses and rescue horses report that this formula puts weight on faster than feeding more hay alone, with visible improvements in energy levels and overall condition. The granules are free-flowing and mix well with wet or dry feed without leaving an oily residue.

A few buyers noted that the bag can go stale if stored in direct sunlight or kept open too long, which can reduce palatability for the most finicky eaters. Transferring the contents to an airtight container after opening is recommended. Picky eaters still accepted the granules even when they rejected other fat supplements, which suggests the extrusion process improves flavor acceptance.

Check Price on Amazon

DAC Bloom takes a targeted approach by combining weight gain support with hoof, coat, and skin health in a single concentrated crumble. The 5-pound bag is compact, but buyers consistently report that a little goes a long way — the crumble format is calorie-dense enough that you don’t need to feed a large volume to see a difference in body condition. Multiple verified reviews note that it works especially well for hard keepers that also have dry or brittle hooves.

The palatability is a standout feature. Several owners of notoriously picky eaters describe their horses actively searching for the crumble in their feed, even when it’s mixed with supplements they previously refused. DAC Bloom also carries a pleasant smell that owners joke is tempting enough to taste themselves, which explains why horses rarely leave any behind in the bucket. The results reported on coat shine are dramatic — horses described as “dull” show a visible gloss within three weeks.

The main consideration is that the serving size on the 5-pound bag goes through faster if you’re feeding a larger horse or increasing the dose for aggressive weight gain targets. Some buyers switch to the larger DAC Oil product after establishing weight, using Bloom as a maintenance crumble. Price per pound is higher than bulkier options, but the concentration means you’re paying for potency, not filler.

Check Price on Amazon

Formula 707 is a legacy name in equine nutrition — John Ewing Company has been formulating horse supplements since 1948, and this Weight Gain Crumble reflects decades of refinement. It relies on vegetable fat for easily digestible calories combined with high-quality protein to provide the amino acids needed for actual muscle-building rather than just fat deposition. The crumble texture is distinct from pellets — it breaks apart easily and adheres well to damp feed, reducing sorting behavior.

Senior horse owners are the most vocal advocates for this product. Multiple verified reviews describe horses that had been losing condition for years finally stabilizing and even gaining a healthy amount of weight within weeks. The inclusion of fiber helps keep the digestive system moving smoothly, which is especially critical for older horses whose gut motility slows down. Horses treat the crumble like a special reward rather than a medication, according to several long-term users.

A small number of buyers expected a pellet format and were surprised by the powdery crumble texture, so it’s worth noting that this is not a hard pellet. The 7-pound bag is a good midpoint size for single-horse households — large enough to see real progress before reordering, but compact enough to store in a feed room without taking up excessive shelf space.

Check Price on Amazon

Horse Guard’s vitamin and mineral supplement is not a straight calorie bomb — it’s a nutritional foundation that corrects deficiencies preventing proper weight gain. If your horse eats plenty of hay but still struggles to hold condition, the problem is often a lack of absorbable selenium, Vitamin E, zinc, or probiotics rather than a shortage of calories. This pellet delivers 3 mg of organic selenium per serving, which is far more bioavailable than inorganic forms, plus 1,000 IU of Vitamin E.

Owners report dramatic behavioral and physical changes when deficiencies are corrected. One verified review notes that ground licking — a common sign of mineral deficiency — stopped within two days of starting this supplement. Coat thickness and hoof quality improvements appeared within 10 days. The pellet form is convenient for horses that get grain, and the dosage of just 2 ounces per day means a 10-pound bag goes a long way for a single horse.

The supplement is designed to be fed alongside hay or pasture, not as a sole source of calories, so it works best as a partner to a weight gainer rather than a replacement. Horses already on a complete feed may not need the extra mineral load. The unflavored pellets are plain enough that most horses accept them readily, but extremely picky eaters might need the pellets disguised in a small amount of molasses or wet beet pulp.

Check Price on Amazon

DAC Oil takes a completely different approach from dry supplements — it’s a liquid fish-oil concentrate that you pour directly over feed, providing a highly digestible fat source that starts working immediately. The liquid format is especially useful for senior horses with dental issues, horses recovering from illness who have reduced appetite for dry feed, or horses that easily sort out pellets and crumbles. The added Vitamin E acts as a preservative for the oil and provides antioxidant support for muscle health.

Multiple verified buyers highlight improvements in itchy skin, stiff joints, and dull coats alongside the weight gain effect. The omega-rich fatty acid profile from fish oil supports systemic inflammation reduction, which can help older horses feel more comfortable moving to the hay feeder, thereby increasing their voluntary feed intake. The gallon jug includes a pump dispenser that helps owners control portions and avoid the sticky mess that comes with pouring liquid supplements from a wide-mouth container.

The fishy smell is noticeable both in the jug and on the feed, though most horses develop a taste for it quickly. A few owners reported initial hesitation from their horses for the first two to three days before they began licking the bucket clean. The one-gallon size is appropriate for a single horse for about 30–45 days depending on the dose used.

Check Price on Amazon

PetAg Dyne is a high-calorie liquid emulsion that provides a dense concentration of energy in minimal volume — it’s designed for rapid weight gain in underweight, stressed, or recovering livestock including horses, goats, and pigs. This is not a subtle maintenance supplement; it’s a therapeutic tool for animals that need to put on weight fast. The formula is high in fat with added vitamins, and it’s intended to be poured over or mixed into feed, with dosing adjusted downward as body condition improves.

Show horse owners use Dyne to get animals into peak condition before competitions, taking advantage of the low-volume, high-energy profile that doesn’t fill the gut with bulk. The liquid consistency means there’s no risk of sorting — it coats every kernel of grain, making it nearly impossible for a horse to leave the calories behind. The gallon size is economical for multi-animal households or barns, and the shelf-stable formula doesn’t require refrigeration before opening.

Buyers using Dyne on horses specifically note that it works best when the horse already has a good appetite but needs an extra caloric push. It is less suitable as a standalone treatment for horses that aren’t eating at all, as they still need to consume their base ration to get the full benefit. A few owners of goats and pigs also report successful weight gain using this product, confirming its versatility across different livestock species.