Clover Slobbers: When Your Horse Eats Clover and Turns Into a Faucet

You turn your horse out on a pretty spring pasture, everything’s green and peaceful, and then you look over and… yep. Your horse is drooling like they’re auditioning for a role as “leaky garden hose.”

If you’ve seen that sudden, stringy saliva, you’ve probably met clover slobbers. It’s gross, it’s dramatic, and most of the time it’s not an emergency. Still, it’s worth knowing what’s going on so you don’t miss the rare times it is serious.

This article is general information and not a substitute for veterinary advice.

What “clover slobbers” is

Clover slobbers usually happens when a clover has a fungus growing on it. That fungus can lead to a compound called slaframine, often nicknamed the “slobber toxin,” which tells your horse’s body to make a whole lot of saliva.

Translation: it’s often not the clover itself that’s the problem. It’s the clover/fungus combo.

What it looks like in real life

This is not a polite amount of drool.

You’ll see long strings of saliva, wet forelegs, a soaked chest, and sometimes a puddle where your horse has been standing. Some horses also get watery eyes, mild diarrhea, or increased urination.

The classic clue is timing: your horse is fine, they graze clover or eat clover-heavy hay, and then the drool starts.

The “is this an emergency?” checklist

Call your vet promptly if you see drooling plus any of these:

• coughing, gagging, or trouble swallowing (choke can cause drool, too)
• not eating, acting painful, or showing colic signs
• fever, depression, or anything that feels “off”
• drool that doesn’t improve after you change the forage

While clover slobbers are common, drooling can also be a symptom of other issues that might be more serious.

What to do today

1. Remove the clover source. Bring your horse off that pasture or stop feeding that clover-heavy hay. This is the big fix.
2. Offer simple forage and fresh water. Think grass hay, not “mystery green buffet.” Keep it simple.
3. Check pasture mates. If one horse is drooling and others are eating the same forage, you might get a whole barn of drip. Catch it early.

Most horses improve quickly once they’re off the problem forage, often within a day or two.

What to look for in pasture or hay

Sometimes clover leaves get dark blotches associated with the fungal “black patch” problem. You may see little dark spots or patches on leaves, especially when conditions have been warm and wet.

You don’t have to become a plant scientist, though. If the slobbers show up, your safest move is still the same: remove the suspected forage and talk to your vet if anything else looks wrong.

A few quick, barn-friendly tips

• Clover can be nutritious. It’s not automatically “bad hay.” The fungus is the real party crasher.
• If your hay is clover-heavy, you may be able to dilute it with grass hay when slobbers pop up, or switch batches.
• If you want to reduce clover in a pasture long-term, mowing and encouraging grass to outcompete clover is recommended.

If you’re the kind of person who likes to decode barn notes like “no clover hay right now,” TurnoutAI can help translate terms like “slaframine” and “mycotoxin” into plain English without sending you into a late-night research spiral.

In summary

Clover slobbers is one of those horse things that looks much worse than it is. The drool is often triggered by slaframine from fungus-infected clover, and the simplest fix is to remove the horse from that pasture or hay. If anything else seems off, call your vet and rule out the bigger issues.

Join the conversation

Have you had a clover slobbers incident? Pasture season, clover hay, or the year the whole barn turned into a slip-n-slide? Share your story in the TurnoutHQ community so the next person doesn’t panic at the first string of drool.

Sources

• Penn State Extension: “Does Your Horse Have the Slobbers?”
• University of Minnesota Extension: Clover and slobbers (black patch, management)
• MSD Veterinary Manual: Slaframine toxicosis
• Michigan State University Extension: Clover toxicity and horses
• University of Wisconsin Extension: “Slobbers in Horses”