I became motivated to investigate different feeding systems after I noticed how horses kept in any kind of enclosure other than pasture, became fixated on food! Even though they received the right amount of hay and/or feed for their body weight and activity level, they were psychologically “starving”.
Of course, since a horse’s stomach produces acid (for digestion) continually, it makes even more sense why a horse fed even 4 times per day would become distressed about food.
When I had my horses on pasture for 10 years in Alberta, they never showed any anxiety about going out for rides, or impatience to get back home, or any tension at feeding times. So I think the contrast with horses kept in stalls, paddocks, or dirt enclosures was really striking for me and I personally do not enjoy hanging out with a horse who is always thinking about food, or trying desperately to get a mouthful of grass.
On the flip side, if you give a horse in a stall or paddock 24/7 access to unlimited hay, they can overeat and end up with laminitis, colic, founder, etc. The solution to this dilemma is slow feeders filled with low sugar hay!
Slowfeeders allow the horse access to hay and the ability to “graze” for most of the day, yet only consume a healthy amount of hay.
From what I’ve seen and my discussions with others who have experimented with various types of slow feeders, here are the key points to keep in mind:
1. On a metal or plastic feeder, the openings need to be the right size. 2″ – 4″ square or round seems to be the optimal size hole – depending on the horse (no smaller than 2 inches). Some slow feeders have rows of slats (not a grid) so unless you have a horse that needs a lot of hay, the slat design will allow them to consume too much, as it’s much easier to pull out large strips of hay. However, as with all slowfeeders, you need to keep an eye on your horse’s teeth and gums, or this can happen:
I keep an eye on my horse’s teeth, and I had 7 different horses eating from my 2-inch metal grate slow feeders (2″ x 2″ openings) for over 4 years and all their teeth were fine. Then I changed my hay vendor and two of the horses damaged their teeth. So I switched to 4-inch openings and all my horses (11 total) have been fine with the 4″ openings for years now.
Again, whether using nets or metal grates, you must check your horses’ teeth and gums regularly. It’s also a good idea to offer both grates and nets, so the horse can choose and also vary the pressure points.
2. You must have a trapping method that prevents the horse from grabbing the grid and tossing it out of the feeder. Not every horse will figure this out, but some do.
3. Some people prefer slow feeder nets (hay nets), but you also need to check your horses gums to ensure they aren’t getting damaged by pushing or rubbing against the nylon. Here’s what might happen (but many hay net users have never experienced this) and again, none of the 11 horses at my place have any problems with using hay nets:
Many have found 1.5″ holes to be the best size for a hay net slow feeder – especially if your horse is new to hay nets, or you have a larger horse. For small ponies, or those very skilled at extracting hay, a 1″ net might be better – but then definitely check their gums regularly.
After purchasing hay nets from 5 different vendors, I prefer the hay nets from Handy Hay Nets and Hay Chix for ease, softness (non-abrasive) and durability. And I prefer the 2-inch hole haynets for my crew. I feed a lot of 1st cut hay, which is coarser (better for self-floating their teeth!) and I have large horses so the 2-inch nets work best for us. Sometimes I’ll put out 1.5″ and 2″ nets, so they have a choice. Horses often enjoy the ‘puzzle’ of extracting hay from nets.
If your horse is shod, then your hay net must be in a protective feeder (poly, metal or wood) as horses will paw the net and may get the heels of their shoes caught.
If you’re considering using hay nets, you can search Pinterest, or various slow feeding or Paddock Paradise groups on Facebook for creative ideas on how to load, hang, clip and position your hay net, like this one:
4. Your slow feeder should be as close to the ground as you can get it. This simulates the natural grazing position that is best for the neck and topline (spine) of the horse and also helps prevent hay dust inhalation. Obviously, the picture above directly contradicts this! But a hung net like that one might be primarily for play-eating or variety, with the majority of their hay nets at ground level.
5. Set up your slow feeders the same way you set up your hay piles – with one extra. This prevents stress and anxiety from the dominant horse(s) moving the others off the feeder. So if you have 4 horses, you might get a 4-horse slow feeder + a 1-horse slow feeder. Or two, 2-horse slow feeders + a 1-horse slow feeder. Think about your herd dynamic before you select the size and number of feeders. For example, if you have a super pushy horse who likes to eat alone, then he might take over the 4-horse feeder for himself, leaving your other 3 to share the 1-horse feeder. So then you would need a different configuration to get it to work for your herd. Also be prepared to do what you think will work and then watch them for a week or so; make adjustments as needed.
6. Make sure your feeder is made of non-toxic materials and untreated wood. Remember that your horse will be inhaling for hours in the feeder and touching it with his lips (mucous membranes are highly absorptive). You can use treated wood on the outside of the feeder, away from the opening, and for the bottom that sits in mud or snow. Of course, also avoid sharp or protruding parts.
Alright, so here’s my overview of some sturdy slowfeeder options, along with some pros and cons…
DRURY HEALTHY HORSE FEEDER
There are three models of the Drury Healthy Horse Feeder available. They have grid systems for your pasture, or your horse’s stall, and a hay net system for a round bale.
What I like about this feeder is that it is low maintenance. What I don’t like about it is that the horse will be twisting his head/neck to the side to grab each mouthful – this is an unnatural position and movement to be doing all day, every day, and perhaps your horse will need ongoing chiropractic adjustments. However, depending on how you position your hanging hay net, your horse may be in a similar position anyway.
HOMEMADE SLOWFEEDER – Wood & Plastic Grate
Now if you live somewhere extremely cold, then you may not want to use a metal grate slow feeder as the horses’ lips or tongue may get stuck on the metal! So this resident of the Yukon in Northern Canada came up with the ingenious idea of using plastic puck board.
However, as you can see from the video, this box is too small for 2 horses and likely the dominant horse will be well fed and the other one… not so much.
I like to follow the same rule for slow feeders as with hay piles. I have one extra. That way the dominant horse can move the others around as much as he/she wants and there is always a place for all to eat. This really reduces stress/anxiety around feeding – which is not good for any being!
HOMEMADE SLOW FEEDER – With Framed Hay Net
If you like an easy-to-load slow feeder box, but you prefer a hay net to a metal grate, then this video shows you how to do that cheaply and easily. Personally, I would not make the box out of PVC as it off-gasses toxins (I don’t have it in my home either), and if you make a wood box, it will be heavy enough to be placed anywhere and won’t move around too much. To skip the PVC box-making, and go straight to how to rig the hay net, start watching at 1:30 minutes:
THE SLOW GRAZER
This Slow Grazer slowfeeder has everything I was looking for – really easy to load, no protruding parts, perfect size grid, and a sturdy lid to prevent a horse from lifting the grid out and tossing it away. The underside (that contacts the ground) is pressure treated to prevent the wood from rotting – but the rest of it is not. This is a really good thing as I don’t want my horse ingesting chromium and copper from pressure treated wood. And (at the time of writing) the price is excellent – only $275 for a 4’x4’x28″ feeder. They also sell the plans if you have the skills and desire to build your own. Joe (the owner) told me the feeders can sit out in the rain and are good for 8-10 years. Then you may need to replace the gussets in the corners. I ordered two of the 4’x4′ feeders for the three horses in my pasture. Thinking that would not only suffice for right now, but would likely still work if I happened to add another horse or two to my pasture. Little did I know I would add 8 more horses over the next few years! So I’ve also added a few more of the 2’x2’x28″ feeders, along with a hay net or two.
Here’s the only possible downside to this kind of slowfeeder (IF your horse is tall enough to get a front leg in there): This is what my Belgian mare does to the grates when she gets mad that she can’t just gobble the hay:
However, I have had 11 different horses eating from these slow-feeders and she is the only one who stomps on the grates like this!
So, since she joined the herd, I switched to a mix of this size grate (2×2-inches) and a 4×4-inch grate, and a 2″ hay net, so my Belgian has a few choices! When I changed my hay vendor and fed primarily 1st cut hay, then I switched all of the grates to 4×4-inch openings.
A reader found this slow feeding solution and asked for my opinion. I thought it looked good enough to give it a try, so I bought the XL feeder from Porta-Grazer to test with my herd. Here’s a short video showing you how it’s constructed and how it works:
After using it for three weeks, here’s my review of the pros and cons of this feeder. First of all, the lid/locking mechanism looks like a good one. It is VERY sturdy and nicely heavy. I roped it to a large beam in my barn using a chain and there has been no damage whatsoever.
Since I have 4 young, playful horses in my herd, I would not leave this feeder loose (as they show in some of their videos) as I’m pretty sure they would crack it.
Here’s my feedback on it’s function: I packed it with large, stalky hay (alfalfa) and it worked great. When I packed it with soft strands of hay (orchard grass) it didn’t work so well – they couldn’t get it out and ended up mashing/crushing it into little bits that were then impossible to get out. I also purchased the unit with Draft-size openings (the largest holes available).
I was trying to figure out why this could be – since the orchard grass works best in both my metal grate slow feeders and hay nets. Then I realized that due to the shape (about 2 foot wide barrel) the horse cannot really get their head/mouth sideways. So they can’t use a lot of angles to pull the hay out. They can mostly only eat straight on and tilted a little bit to the side.
If you watch the video above, you’ll see that the the horse is eating a stiff, stalky rye grass and as you watch his mouth action you’ll see what I mean about how they can’t angle too much to the side to get to the hay.
However, as the weeks wore on, they gradually learned how to extract the orchard grass – my system is to use low-sugar orchard grass in my slow feeders and give a small amount of alfalfa loose. However, within a month of them figuring out how to pull out the hay, they also figured out how to get the lid off! And not just once in a while, but every single time I filled it.
The other issue I noticed is that once the horse starts to eat down the hay, their head is disappearing into a hole with no visibility whatsoever. This is fine for the dominant horse or two, but others further down the pecking order will only eat from it when the more dominant ones are far away – because they can’t move to get out of the way if they can’t see the boss horse coming!
If you had a horse in a stall, or a couple of very docile horses, it would probably work just fine. I don’t know whether Bermuda or Teff would work well in this feeder either as I haven’t tested them.
Unfortunately, due to them being able to unlock the lid every single time, I have had to retire the Porta-Grazer and it now sits in my tack room. I’m not sure which horse is removing the lid – I do have one horse who can undo the chains looped around my gates, so perhaps he’s the culprit. Regardless, once the lid is off, they just pull out all the hay and stomp it into the ground – $15/bale and a huge mess to clean up.
On the plus side it is much easier to pack/load than a hay net!
THE HAY PILLOW
The Hay Pillow is a type of hay net that is designed to be placed directly on the ground. It has a solid back and sides to prevent the hay from getting dirty and dusty.
All of my horses like this Hay Pillow – except for my Belgian who dislikes all hay nets – and if you live in a dry (or snowy) climate, this solution would work well. It wouldn’t work well for a muddy, rainforest climate like mine though – unless I wanted to clean it regularly!
The other point to keep in mind is that the Standard size only holds 8 pounds of hay, so you would need to refill several times a day. Again, this doesn’t work for me as my 4’x4′ Slow Grazers hold 200 lbs of hay – so with 4 horses I was filling feeders once every 2-3 days, and with 11 horses, I was filling once per day, which I prefer.
However, I might want to use a Hay Pillow if I ever wanted to slow down my horses consumption of their daily alfalfa. Currently, I feed alfalfa loose – but the Hay Pillow would be just the right amount for each horse. So I will definitely keep it in mind. Here’s a great article on keeping your horses mentally and physically comfortable when eating.
The huge benefit to this slow feeder net (vs. a regular hay net) is that it doesn’t need to be anchored to anything and the horse’s head can be down very close to the ground. Having it move around will likely reduce frustration from impatient/aggressive eaters. Here’s my review of the Hay Pillow:
So what’s my take-away from all this research? A reader emailed to ask:
“What size are the slow grazers you have for your horses and are you happy with them or would you have made them bigger or smaller if you did it over? How long a period does the hay last in them. Have you found any problems with their teeth or gums? Anything else you could tell me about them would be greatly appreciated. I think I will need them placed where there is overhead cover. I noticed you have a large area with a roof over them in the blog.”
Excellent questions! And here’s my answer:
If you can cover the slow grazers, then I would go with the 4’x4’ feeder – if you had two of them for your 3 horses, then you would probably only need to fill once every 4-5 days or so. If you’d like to see every aspect of my setup, here’s a video where I take you on a tour of my barns and paddock area.
For my slow feeders, every 2 weeks, I let the horses eat them down to nothing (I rotate this – emptying one feeder at a time – so they are never without food, unless it’s the summer when they can graze), then I scoop out the dusty remains and refill entirely. The feeder also has holes drilled in the bottom for aeration.
If you will have the boxes out in the open – getting rained on – then I would go with 2’x2’ boxes so they can eat it before anything has a chance to go moldy. Although, if you only had ONE 4×4’ feeder, they would eat that down no problem, before any chance of mold. The Slow Grazer guy runs a boarding facility and has his outside in the open 24/7 – he said they’re good for about 10 years like that in the rainy Pacific Northwest.
No problem with teeth or gums – I check them every month or so. I also adjust grate size according to type of hay – if the hay is easily pulled out, then I can use 2×2” grates, or 2×4” grates. If it’s difficult to extract and breaks easily I use 4×4” grates. The KEY to success is using LOW SUGAR hay.
I purchase my grates from this vendor and then I cut them to size myself – with bolt cutters I purchased from Home Depot. However, thinner steel grates will bend and break more easily, so a few years later, I switched to heavier guage steel. Although the cost is much higher, due to greatly reduced breakage, they worked out cheaper in the long run. I also came across this excellent grate supplier in the U.S., with a variety of sizes, called KC Store and they call theirs Gridwall Panels.
Many people stress themselves trying to find THE perfect hole size for their slow feeder, when really, it depends on the hay. It is such freedom to have access to a variety of grate sizes and to be able to experiment and cut my own (I have slow feeder boxes in 3 different sizes). Note that the Canadian vendor calls these mesh panels, corral panels, cattle panels, hog panels, and the U.S. vendor calls them gridwall or grid panels – so try a variety of search terms when trying to find a vendor in your area.
I wonder if the teeth/gum problems occur when people are making the horses extract via 1” or 1.5” openings… You don’t need to to restrict the rate of feeding if you use low sugar hay! I have drafts, half-drafts and Andalusian – all known to be ‘easy keepers’ and to gain weight in a heartbeat – so I think they’re a pretty good test group.
HOWEVER, after 5 years of using metal grates (with LARGE 4×4″ openings) with no issues whatsoever, two of my 11 horses suddenly developed tooth damage. So then I tested a bunch of other slowfeeder design options, and switched most of my feeders to a hay net grate – with 2×2″ openings. And this worked great.
Now, I couldn’t get low sugar for much of this year (due to drought in the growing season) and two of my horses are now porkie-pies. But, when the boxes are stocked 24/7 with low sugar hay, no one overeats and all stay trim and healthy. I can’t emphasize enough, that for slow feeding free-choice, ad-lib, or 24/7 hay, the hay MUST be lower than 12% NSC. I prefer 10% or lower.
I look forward to the day when hay growers get savvy to the demand for low sugar hay and also start growing a greater variety of forage crops!
If I was going to start over, I would not even bother with hay nets and just go straight to the slow feeder boxes with grates 🙂 Unless you’re feeding round bales – then a hay net makes sense.
THE BEST HAY TO FEED
Now that you have your slow feeder in place, you need to make sure you fill it with the right kind of hay to keep your horse healthy and at a good weight!
And remember to check front teeth and gum line every month or two, ongoing, to ensure your horse is not damaging their mouth on your slow feeders.
Originally published 2014. Updated October 2023.