Table of contents
Key Takeaways
- Foxtails are barbed grass seeds that move in only one direction, so once one attaches to your dog it burrows deeper into the body and will not work its way back out on its own.
- The most common warning signs show up right after a walk: sudden focused licking of a paw, head shaking or ear scratching, a fit of violent sneezing, or a red, squinting eye.
- After every walk on a Phoenix trail, check your dog's paws, ears, face, and underside, and remove any visible awns with tweezers before they have a chance to burrow.
What are foxtails, and why are they so dangerous to dogs?
Foxtails are the dried, barbed seed heads of certain grasses, and they are dangerous because each seed is shaped like a tiny arrow. The seed has a sharp point on one end and rows of stiff, backward-facing bristles trailing behind it. Those bristles let the seed travel in only one direction, forward, so once it lodges in your dog it keeps pushing deeper with every movement and cannot back out.
The word foxtail does not refer to a single plant. It is an umbrella term for a group of grasses with seed heads that resemble a fox's bushy tail. In spring these grasses are soft and green, and many dogs find them appealing to chew. As the weather dries out, the seed heads turn golden and brittle and begin to break apart into individual seeds, each one tipped and ready to attach. This is when they are at their most hazardous.
Once a foxtail attaches, it can enter almost anywhere: between the toes, in the ears, up the nose, into the eyes, in the mouth and gums, in the genitals, or straight through the skin in an armpit or other fold. From there it migrates through the tissue, carrying bacteria with it and causing infection, swelling, and abscesses. In rare but serious cases, an inhaled awn can travel into the lungs and cause pneumonia or a lung abscess. The seeds are remarkably durable and resist breaking down in the body, which is why they sometimes turn up in surgery long after the fact. Long-haired dogs are especially prone to picking them up, but short-coated dogs are far from safe, since the seed only needs a fold of skin to take hold.
Where foxtails and other desert grasses grow around Phoenix
Arizona has its own cast of barbed grasses, and they turn up in exactly the places dogs love to explore. According to University of Arizona extension experts, the grasses that cause the most trouble for pets here include cheatgrass (also called downy brome), foxtail barley, sandburs, creeping foxtail, and needle grass. All of them share the same problem: sharp awns that penetrate skin and migrate inward.
You will find these grasses along trail edges, in washes, on roadsides, in vacant lots, and across the disturbed, dried-out ground that is so common around the Valley. They even grow in gravel and cracks in the sidewalk. They are most dangerous in the dry stretch from late spring through summer and into fall, after the winter and spring rains end and the seed heads turn brittle and start to fall apart.
It is worth knowing that foxtails are one of several trail hazards your dog can encounter here. Phoenix-area vets frequently treat dogs for cactus spines, especially from cholla, lodged in the same spots foxtails like: the paws and between the toes. So when you are checking your dog after a desert hike, you are watching for more than just grass seeds. The habit of a thorough post-walk check protects against all of it.
How do I know if my dog has a foxtail?
The clearest sign is sudden, intense attention to one spot on the body right after time outdoors. A dog licking or chewing furiously at a paw, shaking its head, pawing at an eye, or breaking into a fit of violent sneezing has very likely picked something up. Because foxtails burrow and migrate, some symptoms also appear days or even weeks later, as a swelling, an abscess, or a small draining sore.
Here is what tends to show up depending on where the awn lodges.
Paws and between the toes
This is the single most common location. Watch for limping, swelling between the toes, persistent licking or chewing of one foot, or a small lump or weeping hole that may appear later as an abscess forms.
Ears
An awn in the ear canal causes sudden, vigorous head shaking, tilting the head to one side, scratching at the ear, or crying out. Dogs with long, floppy ears are especially prone to this.
Nose
An inhaled foxtail triggers sudden, violent, repeated sneezing, often paired with pawing at the nose and sometimes a little nasal discharge or blood. The sneezing fit usually comes on fast.
Eyes
A foxtail near the eye causes squinting, redness, tearing, swelling, or a dog holding the eye shut. This is uncomfortable and needs prompt attention.
Skin and elsewhere
On the body, look for new lumps, red or tender areas, abscesses, or a spot your dog keeps licking. If an infection sets in, you may also notice decreased appetite or lethargy. If your dog develops a sudden cough or trouble breathing, an awn may have reached the lungs, and that is an emergency.
What should I do if my dog gets a foxtail?
If you can see an awn caught in the fur or only barely embedded, remove it right away with a pair of tweezers, the same way you would remove a tick. Grasp it close to the skin, pull steadily, and check that it came out whole. Foxtails are always easiest to deal with before they burrow, so a careful check right after a walk is your best chance to catch one.
If the awn is already embedded under the skin, or it is lodged in the eye, ear, nose, or another sensitive spot, do not dig for it. Probing near the eyes, ears, or nose can injure your dog and can push the seed in deeper. These situations call for a veterinarian, and the sooner the better, because the longer an awn stays in, the farther it travels. Depending on where it is, removal may require sedation or minor surgery, and your dog may need antibiotics if an infection has already started.
Some signs mean you should not wait: trouble breathing, an eye held shut, a rapidly swelling area, or a dog in obvious distress. Head to urgent care right away. If you are unsure whether what you are seeing warrants a visit, Modern Animal members can reach our care team anytime through 24/7 Virtual Care to talk it through and get guidance on next steps.
How can I protect my dog from foxtails on the trail?
The best protection is avoiding exposure in the first place. Stick to cleared, maintained trails and keep your dog out of the dry, overgrown grass along the edges and in washes. Keeping your dog leashed in these areas gives you control to steer them away from the worst patches.
After that, the habit that matters most is the post-walk check. Every time you come back from a Phoenix trail, run your hands and a fine-toothed comb through your dog's coat and inspect the usual hiding spots: between every toe and the paw pads, inside and around the ears, the face and mouth, the armpits, the groin, and the belly. Remove anything you find before it has a chance to burrow.
A few more steps go a long way:
- Keep the fur on your dog's feet and legs trimmed short during the dry season, since long hair gives foxtails more to grab onto.
- Consider dog booties to protect the paws, which are the most common entry point.
- For dogs who spend a lot of time in heavy foxtail country, a lightweight mesh head net designed for this purpose can keep awns out of the eyes, ears, nose, and mouth.
- At home, keep your yard mowed and pull any foxtail plants by the roots before they go to seed. Bag them and throw them away rather than composting, since the seeds survive.
One more benefit of an early-morning routine: walking at dawn keeps your dog off hot pavement and out of the midday heat, and it pairs naturally with a careful check before you both settle in for the day. For more on timing your walks safely through the year, see our guide to safe Phoenix walk times.
What does it cost to have a foxtail removed?
The cost of treating a foxtail varies by location and, more than anything, by how involved the removal is. A visible awn caught in the fur or just under the skin may be a quick extraction during a standard visit. One that has burrowed deep, or settled in the eye, ear, or nose, can require sedation or minor surgery, which changes the picture considerably.
Several factors influence the final price: whether it is a routine or urgent visit, where the awn is lodged and how deep it has traveled, your dog's age and health history, and whether additional diagnostics or treatment for a secondary infection (such as imaging, antibiotics, or pain medication) are recommended. Because every case is different, the best step is to have your dog seen promptly so the problem is addressed while it is still simple.
For a full breakdown of service and test pricing at Modern Animal, visit modernanimal.com/pricing. Everything is listed transparently so you know what to expect before you come in.
The bottom line
Foxtails and desert grasses are one of those hazards that look like nothing and can turn into something, but they are very beatable. Almost every foxtail problem starts as a seed sitting in the fur, easy to spot and easy to remove, and the dangerous ones are simply the ones that get missed. A thorough check after every Phoenix hike, a short coat in the dry months, and a habit of steering clear of overgrown grass will keep your dog out of trouble the vast majority of the time.
If your dog will not stop licking a paw, has a sudden sneezing fit, or develops a swelling after a walk, do not wait it out. Members can message our team anytime through 24/7 Virtual Care to figure out whether a visit is needed, and you are always welcome to book a visit at a Modern Animal clinic so we can take a look. Caught early, a foxtail is a minor nuisance, and a little vigilance keeps it that way.
Frequently Asked Questions
Yes. Foxtails are barbed grass seeds built to move in one direction, so once one attaches to your dog it burrows inward and cannot back out on its own. As it travels it carries bacteria, which can lead to painful infections and abscesses. Most cases are minor when caught early, but an awn that reaches a sensitive area like the eye, ear, or nose, or in rare cases the lungs, can cause serious problems. The danger comes from the ones that go unnoticed, which is why a check after every walk matters so much.
Foxtails and other desert grasses are most dangerous once they dry out and their seed heads turn brittle and start to fall apart, which generally runs from late spring through summer and into fall, after the winter and spring rains end. The grasses are softer and greener earlier in the year, but as the Valley heats up and dries, the risk climbs. The dry months are when a short coat and a careful post-walk check matter most.
The most common sign is sudden, focused attention on one spot right after time outdoors: licking or chewing a paw, shaking the head, scratching at an ear, pawing at a red or squinting eye, or a fit of violent sneezing. Because foxtails burrow, some signs show up later as a swelling, a draining sore, or a spot your dog keeps licking. If you notice any of these, check the area closely and look for a visible awn.
If you can see an awn in the fur or barely embedded, remove it right away with tweezers, the way you would a tick, and check that it came out whole. If it is already under the skin, lodged in the eye, ear, or nose, or you cannot fully remove it, do not dig for it, since you can injure your dog or push it deeper. That is a job for a veterinarian, and the sooner the better, because embedded awns keep migrating. Trouble breathing, an eye held shut, or a rapidly swelling area means you should head to urgent care immediately.
Only with great care, and not at all on hot days. Phoenix closes its trails to all dogs once the temperature reaches 100 degrees, due to the risk of heat stroke and pavement burn, and violating that policy can carry a substantial fine. If you hike with your dog in the warmer months, go at dawn on cooler days, bring plenty of water, turn back at the first sign of overheating, and always check the forecast before you head out.