Foreign Body Injuries in Dogs: Grass Seeds and Welfare
The Foxtail Problem
Grass seeds, particularly from barley grass, bromegrass, and other awned grasses, are a common and serious welfare hazard for dogs in late spring and summer. The seeds have backward-pointing barbs that allow them to travel through tissue but not reverse out. They most commonly penetrate between the toes, into the ear canal, through the nasal mucosa (causing sneezing), into the eye (causing corneal ulceration), into the prepuce, or puncture the skin anywhere on the body. They can migrate deep into tissue, causing abscesses and sinuses.
Welfare Consequences
Foxtail penetration causes acute and progressive welfare harm. Between the toes: swelling, pain, and draining tract that will not heal without seed removal. In the ear: intense discomfort, head shaking, scratching. In the nostril: violent, repetitive sneezing (sometimes with bleeding). In the eye: blepharospasm, squinting, corneal ulceration. Internal migration: fever, localised abscess formation, or pleural empyema if reaching the thorax. Seeds in the lungs can cause chronic, life-threatening pneumonia.
Diagnosis and Removal
Early seeds in the ear can often be removed under sedation with otoscope and forceps. Interdigital seeds are removed by surgical exploration of the tract. Nasal seeds may be removed with rhinoscopy. Deep or migrating seeds require advanced imaging (ultrasound, CT) to locate before surgical retrieval. Seeds are difficult to visualise on standard radiography as they are not radio-opaque. Thorough exploration of all draining tracts is required as incomplete removal causes recurrence.
Prevention
Preventing foxtail injuries requires: regular body checks after walks in areas with seeding grasses, particularly between the toes, ears, and groin; trimming hair between the toes and around the ear canal in dogs with long coats; immediate removal of seeds found on the coat before they penetrate; avoiding seeding grass areas in summer, particularly in dogs with long or fluffy coats; and owner education about the signs of penetration.
Seasonal Welfare Alert
Foxtail injuries are most common from May to September, with peak risk in June-July when grasses are seeding. Dogs walked in parks, farmland, and natural areas are at highest risk. Immediate veterinary assessment for any dog showing sudden, repetitive sneezing; acute lameness after a walk in summer; or swelling and draining tract on a limb after the grass-seeding season. Early treatment prevents the significant suffering of deep migration.