Can dogs actually get hairballs like cats do?

Yes. Any dog that licks itself, licks a housemate, or chews on fur, wool bedding, or plush toys can swallow enough hair to form a compact mass in the stomach, technically called a trichobezoar rather than a true hairball. The Merck Veterinary Manual classifies bezoars as a recognized cause of gastric and intestinal foreign body obstruction in companion animals, noting that trichobezoars form when ingested hair fails to move through the digestive tract and instead mats together with mucus and food debris (Merck Veterinary Manual, 2023).

Dogs lack the fishhook-shaped tongue papillae that make cats so efficient at self-grooming, so trichobezoars are reported less frequently in dogs than in cats, but breeds and individuals with excessive self-licking, allergic skin disease, or compulsive grooming behavior are documented to be at higher risk (Cornell University College of Veterinary Medicine, 2022). Dogs that chronically over-groom due to itchy skin, anxiety, or a housemate's shedding are swallowing hair almost continuously, which raises the odds a mass eventually forms.

What are the first warning signs an owner is likely to notice?

Most dogs with a small, non-obstructive hairball simply vomit up a cylindrical, matted wad of hair, sometimes streaked with bile or food, and then act completely normal afterward, still eating, drinking, and playing with no repeat episodes. The American Veterinary Medical Association lists a single episode of vomiting in an otherwise bright, hungry dog as generally low-risk, whereas recurring vomiting is a signal that something is not passing normally (AVMA, 2023).

When a trichobezoar starts to obstruct rather than simply irritate the stomach lining, the pattern changes: repeated vomiting, refusal of food or water, a hunched or painful abdominal posture, lethargy, and reduced or absent stool production are typical early red flags. Owners sometimes also notice retching without producing anything, which can indicate the mass has moved into the intestine where it is too large to pass, a scenario that Cornell's veterinary hospital notes warrants same-day evaluation rather than a wait-and-see approach (Cornell University College of Veterinary Medicine, 2022).

Why do some dogs form hairballs while most never do?

Underlying skin disease is one of the biggest drivers. Dogs with flea allergy dermatitis, environmental allergies, or mange conditions often lick and chew at itchy skin obsessively, ingesting far more hair than a healthy-coated dog would. The American Academy of Veterinary Dermatology recognizes chronic pruritus, or itchiness, as a trigger for compulsive licking behaviors that can secondarily lead to hair ingestion (AAVD, 2022, general dermatology resources).

Behavioral causes matter too. Dogs with anxiety-driven psychogenic alopecia, or those living in multi-dog households where mutual grooming is common, are swallowing hair from themselves and littermates. Long-haired and double-coated breeds shedding heavily during seasonal blowouts also present more raw material, and dogs allowed to chew on wool, sheepskin, or plush toy stuffing add another ingestion route entirely.

How does a veterinarian actually diagnose a trichobezoar?

Diagnosis usually starts with a physical exam and abdominal palpation, where a firm, sausage-shaped mass may sometimes be felt in the stomach or intestines. Abdominal radiographs are the first imaging step in most emergency and primary-care settings, though hair itself is not very radio-opaque, so veterinarians often look instead for secondary signs such as gas-distended bowel loops suggesting obstruction (Merck Veterinary Manual, 2023).

When X-rays are inconclusive, abdominal ultrasound is commonly used to visualize the mass directly and assess whether it is mobile within the stomach or wedged in a narrower section of intestine. Bloodwork, including a complete blood count and chemistry panel, helps identify dehydration, electrolyte derangements, or signs of systemic illness that often accompany a prolonged obstruction, guiding how urgently intervention is needed.

What treatment options are used once a hairball is found?

If the trichobezoar is still in the stomach and the dog is otherwise stable, some cases are managed medically with fluids, anti-nausea medication, and monitoring to see if the dog vomits it up or passes it on its own, since not every gastric mass requires immediate surgery. Endoscopic retrieval is an option in some cases when the mass is small enough and located in the stomach, allowing removal without a full surgical incision.

When the trichobezoar is obstructing the intestine, or the dog is not improving with supportive care, surgical removal through a gastrotomy or enterotomy is the standard treatment, and the Merck Veterinary Manual describes surgical extraction as necessary for bezoars causing complete obstruction (Merck Veterinary Manual, 2023). Surgery also allows the veterinarian to check for any underlying cause, such as a foreign object tangled within the hair mass, and to assess whether the surrounding bowel tissue is healthy or compromised.

What can owners do at home to prevent hairballs from forming?

Regular brushing removes loose undercoat before a dog can lick it up, and the American Kennel Club recommends brushing frequency based on coat type, with double-coated and long-haired breeds often needing several sessions per week during heavy shedding seasons (AKC, 2023). Reducing access to shed hair on furniture and floors, and limiting a dog's ability to groom a heavily shedding housemate excessively, also cuts down on ingestion.

Addressing the root cause of over-grooming matters as much as managing the hair itself. A veterinary visit to rule out fleas, food or environmental allergies, and skin infections can stop compulsive licking before it becomes a habit, and in dogs where anxiety drives the behavior, a veterinary behaviorist may recommend environmental enrichment or, in some cases, medication. Avoiding wool, sheepskin, or unstuffed plush toys for dogs known to shred and swallow fabric further limits the raw material available.

What is the long-term outlook after a dog has had a hairball obstruction?

Dogs that pass or vomit up a trichobezoar without surgery typically have an excellent prognosis and no lasting effects. Dogs that require surgical removal generally recover well too, with most discharged within a few days of an uncomplicated gastrotomy, though recovery depends on how much time passed before treatment and whether any bowel tissue was compromised by reduced blood flow (Cornell University College of Veterinary Medicine, 2022).

Because the underlying driver, whether allergic skin disease, anxiety, or simple heavy shedding, does not disappear after one surgery, dogs that formed one trichobezoar are at risk of forming another unless the root cause is managed. Veterinarians typically recommend a recheck plan that includes a skin and allergy workup alongside a grooming schedule to reduce the odds of recurrence.