The Canine Ledger

Grass Awns (Foxtails): Where They End Up

Nine in ten UK grass seed cases come between June and September, and spaniels are most at risk. Where seeds lodge, the signs, and why grooming helps.

Written by thecanineledger

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If, after a walk, your dog suddenly shakes its head or paws at an ear, sneezes hard and keeps sneezing, squints, or licks at a swelling between its toes: see your vet the same day. If it is struggling to breathe, go now.

Our note: These signs are our summary of where seeds lodge. The studies describe sites, not signs owners can see.

A UK study of more than 4.5 million vet consultations found grass seeds in 1,037 dogs. Of those, “940 (90.6 %) recorded between June and September” (Brant et al., Preventive Veterinary Medicine 2021, abstract). The odds of a grass seed case in July were “almost 176 times more than that of January”.

While most grass seeds are found and removed quickly, a few travel deep into the body and cause serious disease. This page explains where seeds end up, which dogs are most at risk, and what helps prevent them.

1. Why grass seeds travel

Grass awns, or foxtails in North America, are the seed heads of some wild grasses. A 2023 systematic review explains that they “can migrate into several body tissues and cavities because of their fusiform shape and backward-pointing barbs” (Caivano et al., Animals 2023). Fusiform means spindle-shaped. The barbs let a seed move forward but not back out.

2. Where they end up

Ears, skin and nose are commonest. A US teaching-hospital study of 754 dogs found “The most common location in dogs was the aural canal, cutaneous/subcutaneous space, and nasal canal” (Philp et al., Journal of Veterinary Emergency and Critical Care 2022, abstract). The aural canal is the ear canal; cutaneous and subcutaneous mean in or under the skin.

In general practice, mostly ears. In rural Australia, ear infection “was the most common manifestation” of grass seed disease in general practice, at 47% (Hicks et al., Australian Veterinary Journal 2016, abstract).

Sometimes much deeper. In the same study’s referral hospital, the commonest problem was pus in the chest (pyothorax), at 34%. The authors also describe “a small number of dogs with catastrophic intracranial disease”, meaning inside the skull.

Most cases do well. The US study concluded that “The short-term outcome for foxtail-associated lesions is good, and most cases can be managed on an outpatient basis.” “A minority of cases develop life-threatening disease”.

3. Which dogs are most at risk

Spaniels. In the UK study, “spaniel breed types were 7.7 times more likely to present with a GSFB” than retrievers. GSFB stands for grass seed foreign body.

Males, slightly. The UK study found males at modestly higher odds.

Rural dogs. The UK study found lower risk in urban areas. Risk was highest in the East of England and lowest in Wales.

Medium and dense coats. In Australia, “Breeds with high-density coats were overrepresented”, and affected dogs had “3-fold greater odds of having medium coats than short coats”.

4. Prevention: grooming, not just checking

The Australian study found that “Some protection from GSFBD was achieved with frequent grooming.” It also found that “Clipping or coat searching without grooming was ineffective as a prevention strategy.”

What that means in practice. Brush your dog properly after summer walks, especially the feet, ears and armpits. A quick look isn’t enough.

Our note: “Especially the feet, ears and armpits” is our advice, based on the common sites.

5. At the vet

Finding the seed. The US study describes vets using imaging, endoscopy (a camera on a tube) or surgery for harder cases. The 2023 review concluded that ultrasound “is a valid diagnostic tool for visualization and guiding the removal of migrating grass awns”.

Antibiotics alone may delay things. A small 2026 study of 18 dogs at a referral centre found that “Patients who received antibiotics prior to referral had longer overall disease durations than patients who did not.” Its authors suggest that where a seed is suspected but not found, “prompt referral for focal ultrasonography will contribute to faster diagnosis and retrieval than symptomatic treatment” (Twyford & Rowan, Veterinary Record 2026, abstract).

A swelling that keeps coming back after antibiotics may have a seed inside it. Ask your vet whether a scan is worth it.

Our note: The 2026 study is small and looks back at past cases. It found no direct link between antibiotics and the fluid pocket that helps vets find seeds.

→ Ear Infections: Why They Keep Coming Back · → Emergency Signs in Dogs: When to Go Now, Not Tomorrow

6. What we could not verify

Commonly saidWhat we found
“Grass seeds only get stuck in paws”No. Ears, skin and nose are all common, and a few reach the chest or skull.
“Clipping the coat stops grass seeds”Not on its own. In one study, clipping without grooming didn’t protect dogs.
“Grass seeds are a minor problem”Usually, but not always. A minority of cases become life-threatening.
“Antibiotics will sort it out”Not if a seed is still inside. One small study found antibiotics before referral linked to longer illness.
“Half of grass seeds end up in the ear”Roughly, in general practice. One Australian study found 47%. We haven’t read the older US study often quoted.

Sources

Always confirm with your vet before acting on anything on this page.