Foxtails are barbed grass seed heads that dry out in late spring and summer across California. Their one-way barbs let them work into a dog’s ears, nose, eyes, paws, or skin and keep migrating deeper. If your dog is sneezing violently, shaking their head, squinting, or licking one paw after a walk, call your veterinarian promptly.
What foxtails are and why summer is the risky season
Foxtails are the bristly seed heads of certain wild grasses, named for their resemblance to a fox’s bushy tail. Through the wet months they stay green and flexible, but as California dries out in late spring and summer, the seed heads turn brown, stiffen, and start to break apart. Each fragment is a hard, pointed seed carrier wrapped in microscopic barbs, and each one is built to hitch a ride on anything that brushes past, including your dog’s coat.
Around Palo Alto and the wider Peninsula, dried foxtails show up along sidewalk edges, in unmowed lots, on trail margins, and in any patch of tall grass that has gone golden for the season. That is why veterinarians in this area tend to see a steady stream of foxtail problems from May through October. A quick romp through dry grass in Barron Park or South Palo Alto is all it takes for a dog to pick several up without anyone noticing.
How one-way barbs burrow in and keep moving
What makes a foxtail different from an ordinary burr is the direction of its barbs. They all point backward, away from the sharp tip, so the seed head can move forward through fur and skin but cannot easily back out. Every time your dog moves, scratches, or shakes, the muscle motion ratchets the foxtail a little deeper. It works like a one-way arrow.
Because foxtails do not break down inside the body, one that gets under the skin or into a body opening can keep traveling. A seed head that enters between the toes may migrate up the leg, and one inhaled through the nose can move farther into the airways. The longer a foxtail stays in place, the farther it can wander and the harder it can be to find, which is why early attention matters so much.
Classic signs of a foxtail, by location
The signs usually point to where the foxtail landed. A dog who starts sneezing violently and repeatedly right after a walk, sometimes with a bit of blood, may have inhaled one through the nose. Sudden, persistent head shaking or tilting, pawing at one ear, or holding the head at an odd angle often points to a foxtail deep in the ear canal. In the eye, watch for abrupt squinting, tearing, redness, or a pawing motion at one side of the face.
Paws are the most common landing spot of all. A swollen toe, a small red bump between the pads, a limp that appeared out of nowhere, or a dog who will not stop licking one exact spot between the toes are all classic clues. On the body, a foxtail under the skin can show up as a tender lump or a small draining sore that does not heal. Any of these signs after time in dry grass deserves a call to your veterinary team.
Why you should not dig for an embedded foxtail yourself
If you spot a foxtail sitting loosely on top of your dog’s coat, brushing it away is fine. The trouble starts once the seed head has worked into the skin, an ear, a nostril, or an eye. Probing with tweezers or fingers tends to push the foxtail deeper, break it into fragments that are even harder to locate, or injure delicate tissue in the ear or eye. A retained fragment can keep migrating and cause ongoing irritation long after the visible part is gone.
Deeply embedded foxtails often need proper lighting, magnification, special instruments, and sometimes sedation to remove safely and completely, especially from the ear canal or nose. Your veterinarian can examine the area, find the whole seed head, and confirm nothing was left behind. In tricky cases, pet diagnostics such as imaging can help the team trace where a migrating foxtail has gone.
Preventing foxtail trouble on Palo Alto walks
The single best habit is a quick nose-to-tail check after every walk during the dry season. Run your hands through the coat, look inside and behind the ears, check the armpits and belly, and spread each paw to inspect between the toes and pads. Foxtails caught on the surface are easy to remove; foxtails found a day later are often already under the skin. It takes about a minute and quickly becomes part of the routine.
Route choices help too. During summer, favor paved paths and mowed, irrigated areas, and steer around dry, overgrown grass wherever you can. Keeping the fur between the toes and around the ears trimmed short makes it much harder for seed heads to catch a ride and much easier for you to spot one that does. Our medical grooming team can keep paw and ear fur tidy for the season, which is especially helpful for longhaired and curly coated dogs.
When to seek prompt veterinary care
Treat a suspected foxtail as a same-day concern rather than a wait-and-see problem. Sudden violent sneezing, nonstop head shaking, a squinted or watery eye, a swollen paw, or a sore that keeps draining are all good reasons to have your dog examined promptly. Early visits are usually simpler for the dog and the owner alike, because the foxtail has had less time to migrate.
Universal Pet Hospital offers urgent care for exactly these situations, along with the broader medical services your dog may need if a foxtail has caused irritation or infection along its path. If your dog came back from a walk on the Peninsula acting suddenly uncomfortable, call us and describe what you are seeing, and the team can help you decide how quickly to come in.
Frequently asked questions
What months are foxtails a danger to dogs in Palo Alto?
Late spring through fall is the main risk window, roughly May through October, once the grasses dry out and the seed heads stiffen and scatter. Dried foxtails can linger on the ground even longer, so it pays to stay watchful whenever grass in the area is brown.
Can a foxtail come out on its own?
You should not count on it. The backward-pointing barbs are designed to keep the seed head moving forward, so an embedded foxtail tends to burrow deeper rather than work its way out. Prompt veterinary attention is the safer path.
How do I know if my dog got a foxtail in the nose?
Sudden fits of violent sneezing right after a walk are the classic sign, sometimes with pawing at the nose or a small amount of blood. If the sneezing does not settle quickly, have your dog seen the same day so your veterinarian can examine the nasal passages.
Can I pull a foxtail out of my dog’s paw myself?
Only if it is resting loosely on the fur or skin surface. Once a foxtail has pierced the skin or slipped between the toes, digging for it can push it deeper or leave fragments behind, so let your veterinary team remove it properly.
Do short-haired dogs get foxtails too?
Yes. Short coats give foxtails less to cling to, but the seed heads can still lodge between the toes and enter the ears, nose, and eyes of any dog. Every dog that walks through dry grass deserves the same after-walk check.