Foxtails are barbed grass seeds that burrow into a dog’s skin, paws, ears, nose and eyes, and they only move one direction once they start. They are common in the dry grass across the Peninsula from late spring through fall. Daily checks after walks and prompt veterinary attention are what keep a small problem small.
Why September is still foxtail season here
Owners often assume the risk ends with summer. On the Peninsula it does not. Our grasses turn gold early and stay dry well into October, and a foxtail is at its most dangerous once the plant has died back and the seed head has gone brittle. That is when the individual awns detach easily, catch on fur, and work their way in.
San Carlos sits right between the two places dogs meet them most. Head into the hills above town and you are in unirrigated open space where dry grass grows right up to the edge of the trail. Stay down along the El Camino Real corridor and you still find them in vacant lots, alley edges, unmowed strips beside parking areas, and the back corners of yards that get watered less than the lawn. A dog does not need a hike to pick one up.
The other reason fall matters is that people relax. The heat eases, walks get longer, and the daily coat check that felt necessary in July quietly stops. Foxtails do not follow that schedule.
What a foxtail actually does
A foxtail is shaped like a tiny arrowhead with backward-facing barbs. Those barbs are the whole problem. They let the seed slide forward through fur, skin and tissue, and they lock it against sliding back out. Every muscle movement, every step, every shake of the head nudges it a little further in.
Unlike a splinter, it will not work its way out on its own and the body cannot break it down. Left alone, an awn keeps migrating and can travel a surprising distance from where it entered. That is why a foxtail that goes in at a paw can end up causing a problem well up the leg, and why waiting to see if it settles is the one approach that reliably makes things worse.
Where they get in, and what you would notice
Each entry point looks different, and knowing the pattern is what lets you catch it on day one instead of day five.
- Between the toes. The most common site by far. Look for a swollen, red bump between two toes, persistent licking of one specific foot, or a small weeping opening. A dog who suddenly will not leave one paw alone is telling you something.
- In an ear. Sudden, violent head shaking that starts on a walk or right after one, tilting the head to one side, or pawing at one ear. This one tends to be dramatic because the awn is against the ear canal and it hurts.
- Up the nose. Explosive sneezing that begins abruptly, often in fits, sometimes with a little blood from one nostril. It may settle after a while, which is misleading, because the awn is still there.
- In an eye. Squinting, a suddenly weepy or red eye, and pawing at the face. Eyes are urgent. Do not wait on this one.
- Mouth and throat. Gagging, retching, repeated swallowing, or coughing that starts after a walk through dry grass.
- Through the skin. Anywhere the coat is thin or the dog is low to the ground. Armpits, the groin, the belly and under the tail all collect them. A soft lump that appears over a few days, sometimes with a small opening that weeps, is the classic sign.
Long-coated dogs and those with feathered feet or floppy ears collect more of them, but short-coated dogs are not exempt. Cats pick them up far less often, though outdoor cats are not immune, particularly in the ears and eyes.
What to do, and what not to do
If you can see an awn sitting loose in the coat, comb it out. That is genuinely helpful and it is where most of them stop.
If it has already broken the skin, or it is in an ear, a nostril, an eye or the mouth, stop there and call us. Do not go after it with tweezers at home. The visible part is often a fraction of what is actually in there, and a failed grab usually snaps off the shaft, leaves the barbed head behind, and drives it deeper. It also hurts enough that a comfortable dog can become a defensive one very quickly.
Do not wait to see whether it settles overnight. Sneezing calming down or head shaking easing off does not mean the awn came out. It usually means it has moved somewhere the dog can feel it less, which is not an improvement.
How they are found and removed
Finding an awn is often the harder half. Once it has burrowed past the surface there may be nothing to see, only a swelling and a very sore dog. Our pet diagnostics support the search when the entry point is not obvious, and a careful physical assessment of the whole limb or the ear canal usually narrows it down quickly.
Removal depends entirely on where it has gone. Something sitting just inside an ear canal may come out in a single visit. Something that has migrated under the skin or into the nose generally needs sedation, both so the area can be examined properly and so it can be removed in one piece without leaving fragments behind. Our surgical services cover that side of it.
Because foxtails move, timing changes the difficulty. A same-day case is usually straightforward. The same awn two weeks later can mean a larger procedure and a tract that has become infected along the way. If your dog is showing any of the signs above, our urgent care service sees walk-ins during clinic hours, and we are open until 8 PM six days a week.
Lowering the risk between now and the first rains
None of this requires avoiding the outdoors. It requires a routine.
Run your hands over your dog after every walk in dry grass, and make it a real check rather than a pat. Spread the toes and look between each one. Lift the ear flaps. Feel the armpits, the groin and under the tail. On a long-coated dog, comb rather than only looking, because an awn sitting in the undercoat is invisible from the top.
Keeping the fur between the pads trimmed short through the dry months removes the spot where a foxtail is most likely to lodge. Staying on the mown part of the trail rather than the golden edge makes a real difference outdoors. In your own yard, cutting back the dry grass along fence lines and behind sheds takes away the supply.
Foxtails are one of several everyday hazards that catch owners out. Our guide to common household pet poisons covers the indoor side of the same habit, which is knowing what to look for before it becomes an emergency. Building both checks into a routine is what preventive care looks like in practice.
Frequently asked questions
Will a foxtail come out on its own if I leave it?
No. The barbs only allow forward movement, and the body cannot break the seed down. Left alone it keeps migrating. Waiting is the choice that turns a quick removal into a larger one.
My dog sneezed hard for ten minutes and then stopped. Is he fine?
Not necessarily, and this is the pattern that catches people out most often. Sneezing frequently eases once the awn has moved further up the nasal passage. If the sneezing started suddenly after time in dry grass, it is worth a look regardless of whether it settled.
Can foxtails affect cats?
Less often, because cats groom thoroughly and spend less time pushing through tall grass. Outdoor cats can still get them, most commonly in the ears and eyes. The same rule applies: do not attempt removal at home.
Are there certain months when it is safe to stop checking?
Once the winter rains arrive and the grass greens up, the risk drops sharply. Through our long dry season, which runs well past September, keep checking. The seed heads are most brittle and most likely to detach when the plant is fully dried out.
Do the mesh hunting hoods actually help?
They can, for dogs that will tolerate one and that regularly run through dry grass. They protect the eyes, ears and nose, which are the sites that cause the most trouble. They do nothing for paws, so the post-walk foot check still matters.
Speak to the team at Revive Veterinary Care
If your dog has been licking one paw, shaking their head, or sneezing in fits after a walk through dry grass, have it looked at while it is still easy to deal with. Call Revive Veterinary Care at (650) 750-0777 to book an appointment. We see dogs and cats from San Carlos, Belmont, Redwood City, San Mateo, Menlo Park and across the Peninsula.
Published by the team at Revive Veterinary Care.
This article is for general educational purposes only and is not a substitute for an in-person veterinary examination or advice about your individual pet. If you have an urgent concern about your pet, contact Revive Veterinary Care or your nearest emergency veterinary hospital right away.
Revive Veterinary Care
718 El Camino Real, San Carlos, CA 94070
Phone: (650) 750-0777
Hours: Monday to Saturday 9:00 AM to 8:00 PM; Sunday Closed