# Stroke in Dogs: Symptoms, Causes, and What to Do A stroke in dogs happens when blood flow to part of the brain is blocked or a blood vessel in the brain bursts, and the signs of dog stroke usually appear suddenly. Most owners notice a wobbly walk, a head tilt, or eyes that flick side to side within minutes, not hours. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - A stroke is a sudden brain event, so signs typically appear over seconds to minutes and may worsen over the first 24 hours [1]. - Common signs include a head tilt, circling, falling to one side, abnormal eye movements, and a sudden change in behavior or awareness [2]. - A stroke is not the same as heat stroke, which is caused by overheating and shows up as heavy panting, drooling, and collapse after heat exposure. - Call your veterinarian or an emergency clinic right away. Rapid worsening in the first day is possible, and some dogs deteriorate severely within 24 to 40 hours [1]. - Do not give any medication or food while you wait. Keep your dog calm, confined, and cool, and go to the vet now. ## What a Stroke Looks Like in Dogs A stroke, also called a cerebrovascular accident, is an under-recognized cause of sudden neurologic problems in dogs [3]. The brain depends on a steady supply of blood. When that supply is cut off, brain tissue in that area starts to lose function. ### What is normal and what is not Dogs trip, stumble, and shake their heads for ordinary reasons. A dog might slip on a slick floor, get up stiffly after a nap, or scratch an ear. Those events are brief and the dog returns to normal. A stroke is different. The change is sudden and it does not pass in a few seconds. Your dog may be fine at breakfast and unable to walk straight by lunch. The problem stays or gets worse. ### The most common signs of dog stroke The primary signs of nervous system disorders include behavioral changes, seizures, tremors, pain, numbness, lack of coordination, and weakness or paralysis of one or more legs [2]. In a stroke, these signs often affect one side of the body more than the other. Watch for: - A head tilt that was not there before - Circling in one direction - Leaning or falling to one side - Weakness or paralysis on one side of the face or body - Abnormal eye movements, including eyes that drift or flick rapidly - A sudden change in behavior, awareness, or responsiveness - Loss of balance or a drunken, unsteady walk - Trouble eating or drinking because of facial weakness ### Stroke in dogs eyes Eye changes are some of the most telling signs. You may see the eyes flick back and forth or rotate when your dog's head is moved. One pupil may look different from the other. Some dogs hold their head turned so the eyes sit at an odd angle. These eye findings point to a problem in the brain or the nerves that control the eyes, not a problem in the eye itself [2]. ### Stroke in dogs symptoms timeline Timing matters. In one reported case, a dog showed sudden one-sided forebrain signs, and an MRI within 12 hours of onset found a large area of restricted diffusion in the territory of the left middle cerebral artery [1]. That dog then deteriorated severely over the next 24 hours, and a follow-up MRI at 40 hours showed bleeding into the damaged area [1]. The lesson for owners is simple. Signs can appear in minutes and can get much worse in the first day or two. Early veterinary care gives your dog the best chance. ## Main Causes of Stroke in Dogs A thrombus is a blood clot that can form when blood flow through a vessel is restricted, when the vessel lining is damaged, or when another condition makes a dog produce clots excessively [4]. All or part of a clot can break off, travel through the bloodstream, and lodge somewhere narrower, blocking flow [4]. Blockage can also happen when foreign material such as bacteria, air, or fat enters the bloodstream [4]. Some clots are infected [4]. Life-threatening blood clots are most commonly seen in animals with underlying diseases that affect the blood's ability to clot [4]. If those conditions go untreated, they can lead to dangerous clotting throughout the body, which blocks small vessels and uses up the platelets and clotting factors needed to stop bleeding [4]. | Cause | Typical clues | How urgent | |---|---|---| | Blood clot blocking a brain vessel | Sudden one-sided weakness, head tilt, abnormal eyes, often in an older dog | Emergency now | | Bleeding into the brain after a clot | Initial signs, then rapid decline within 24 to 40 hours [1] | Emergency now | | Underlying clotting disorder | History of bleeding or clotting problems, other illness | Emergency now | | Heart disease or vessel damage | Known heart murmur or prior heart diagnosis | Same day | | Severe seizure activity with brain injury | Clusters of seizures, unresponsive periods | Emergency now | | Metabolic problems such as low blood sugar, liver disease, or kidney failure | Weakness, confusion, wobbliness that may come and go [2] | Same day | Metabolic disorders can also affect the nervous system and cause neurologic signs, including low blood sugar, liver disease, and kidney failure [2]. Thyroid and adrenal gland abnormalities and electrolyte imbalances can do the same [2]. This matters because some of these problems are treatable, and they can look like a stroke. ## Red Flags That Mean Emergency Go to a veterinary emergency clinic immediately if your dog has any of these: - Sudden inability to stand or walk - One-sided weakness or paralysis - Eyes flicking or rotating, or pupils that look unequal - A seizure, especially more than one in a row - Loss of consciousness or a dog who will not respond to you - Rapid worsening over hours, since deterioration can be severe within 24 hours of onset [1] - Trouble breathing, or a body temperature that feels very high or very low If your dog collapsed after being in the heat, read about [heat stroke in dogs symptoms and treatment](/knowledge/veterinary-medicine/symptom-guides/heat-stroke-in-dogs-symptoms-and-treatment) and [what to do if dog heat stroke](/knowledge/veterinary-medicine/clinical-methods/what-to-do-if-dog-heat-stroke). Heat stroke is a different emergency with a different cause, and it needs cooling and veterinary care right away. ## Stroke vs Heat Stroke in Dogs Owners often mix these up because both cause wobbliness and collapse. The cause is completely different. Heat stroke happens when a dog overheats, often after exercise in hot weather or being left in a hot car. The signs build during or after heat exposure and include heavy panting, drooling, red gums, vomiting, and collapse. For a full breakdown, see [how to tell if your dog has heat stroke and what to do immediately](/knowledge/veterinary-medicine/emergency-and-first-aid/dog-heat-stroke-signs-and-immediate-action). A stroke happens inside the brain from a blood flow problem. There may be no heat exposure at all. The dog may be resting in a cool room when the signs start. If you are unsure which one you are seeing, treat it as an emergency either way and call your vet or an emergency clinic while you are on the way. ## What You Can Safely Do at Home While Waiting Your job at home is to keep your dog safe and get to the vet fast. Do not try to treat a suspected stroke yourself. - Call ahead. Tell the clinic your dog has sudden neurologic signs so they can prepare. - Keep your dog confined. Use a crate, a laundry basket, or a blanket as a stretcher if your dog cannot walk. - Support the head and neck. Keep them level and avoid twisting the neck. - Keep your dog cool and quiet. Move them out of the sun and into a calm, dim space. - Do not give food, water, or any medication by mouth. A dog with facial weakness or trouble swallowing can choke. - Do not give human stroke medications or blood thinners. The dose depends on your dog's weight and condition, and your veterinarian calculates it. - Note the time. Write down when the signs started and what you saw first. This helps your vet plan testing. If your dog is having a seizure, do not put your hands near the mouth. Clear hard objects away, keep the area quiet, and time the seizure. ## What Your Veterinarian Will Check and Test Your vet will start with a full neurologic exam. They will watch how your dog walks, check the eyes and pupils, test reflexes, and look for one-sided deficits [2]. Next comes blood work. A complete blood count and chemistry panel can rule out metabolic causes such as low blood sugar, liver disease, and kidney failure [2]. Blood-based inflammatory markers are being studied in dogs with confirmed cerebrovascular accidents, and dogs with these events had higher neutrophil-to-lymphocyte ratios and systemic immune-inflammation index values than healthy controls [3]. These tests are supportive, not a replacement for imaging. Imaging is the main way to confirm a stroke. MRI can show the area of the brain affected and whether the event is from a blocked vessel or bleeding [1]. In one dog, the first MRI showed a large area of restricted diffusion that was almost invisible on other sequences, which fits a very early ischemic stroke [1]. Your vet may also check for underlying clotting problems, heart disease, and infection, since clots are most common in animals with diseases that affect clotting [4]. Treatment depends on the cause and how sick your dog is. Some dogs need oxygen, intravenous fluids, and medications to control seizures or brain swelling. In one reported case, treatment included intravenous diazepam boluses, a constant rate infusion of potassium bromide, and hypertonic saline for suspected brain swelling, though that dog did not respond [5]. Your veterinarian will choose a plan based on your dog's exam, test results, and weight. ## Prevention and Monitoring You cannot always prevent a stroke, but you can lower some risks and catch problems early. - Keep chronic conditions managed. Heart disease, clotting disorders, and metabolic disease all raise the risk of dangerous clots [4]. - Stay current on wellness visits. Routine blood work can catch liver, kidney, and blood sugar problems before they cause neurologic signs [2]. - Watch for repeat episodes. A dog who has had one event needs monitoring for new or worsening signs. - Know your dog's baseline. If you know how your dog normally walks and holds their head, you will notice small changes faster. - Keep emergency numbers handy. Save your regular vet and the nearest 24-hour clinic in your phone. If your dog has a history of head tremors or shaking that is not a stroke, this guide on [head shaking in dogs](/knowledge/veterinary-medicine/symptom-guides/dog-head-shaking-master-guide) can help you sort out what you are seeing. ## Limitations and When to Contact a Veterinarian This article cannot tell you whether your dog is having a stroke. Only a veterinarian can examine your dog, run tests, and make a diagnosis. Individual cases need a veterinarian. Call or go in right away if your dog has sudden weakness, a head tilt, abnormal eye movements, a seizure, or a rapid decline. These are emergency signs, and deterioration can be severe within 24 hours of onset [1]. Contact your vet the same day if your dog has mild wobbliness, a brief episode that has passed, or a new behavior change you cannot explain. Even if your dog seems better, a veterinary exam is wise. Schedule a routine visit if you have noticed slow, subtle changes over weeks, such as stiffness, head shaking, or occasional stumbling. These are less likely to be a stroke, but they still deserve a checkup. ## Frequently Asked Questions ### Can a dog recover from a stroke? Yes, some dogs improve, but recovery depends on the size and location of the brain injury and how quickly they get care. Rapid worsening in the first day or two is possible, so early treatment matters [1]. Your veterinarian can give you a realistic outlook after examining your dog and reviewing imaging. ### How long do stroke symptoms last in dogs? Some signs improve over days to weeks, and others may be permanent. In one reported case, a dog's condition worsened severely within 24 hours and imaging at 40 hours showed bleeding into the damaged area [1]. There is no fixed timeline that applies to every dog. ### Is a stroke in dogs painful? A stroke itself is not usually described as painful, but your dog may be confused, unsteady, or frightened. Seizure activity and brain swelling can make a dog very sick [5]. Your vet can address comfort and any underlying problems. ### Can I give my dog aspirin or a blood thinner if I suspect a stroke? No. Never give human medications to a dog with suspected stroke. The dose depends on your dog's weight and health, and your veterinarian calculates it. Giving the wrong drug or amount can cause serious bleeding or other harm. ### What else can look like a stroke in dogs? Many conditions can mimic a stroke, including low blood sugar, liver disease, kidney failure, electrolyte imbalances, and thyroid or adrenal problems [2]. Inner ear disease, seizures, and spinal problems can also cause wobbliness or a head tilt. This is why a veterinary exam and testing are needed. ## Related Articles - [Heat Stroke In Dogs Symptoms And Treatment](/knowledge/veterinary-medicine/symptom-guides/heat-stroke-in-dogs-symptoms-and-treatment) - [What To Do If Dog Heat Stroke](/knowledge/veterinary-medicine/clinical-methods/what-to-do-if-dog-heat-stroke) - [How to Tell If Your Dog Has Heat Stroke and What to Do Immediately](/knowledge/veterinary-medicine/emergency-and-first-aid/dog-heat-stroke-signs-and-immediate-action) - [Comprehensive Guide to Head Shaking in Dogs: Causes, Diagnostics, and Treatment](/knowledge/veterinary-medicine/symptom-guides/dog-head-shaking-master-guide) - [Dog Heat Stroke](/knowledge/veterinary-medicine/clinical-methods/dog-heat-stroke) - [Neurological Examination in Dogs: A Practical Guide](/knowledge/veterinary-medicine/clinical-skills-training/neurological-examination-dogs-practical-guide) ## References 1. [Case Report: Clinical and MRI features of hemorrhagic transformation after ischemic stroke in a dog](https://pubmed.ncbi.nlm.nih.gov/40607364/). Frontiers in veterinary science, 2025. 2. [Nervous System Disorders and Effects of Injuries in Dogs - Dog Owners](https://www.merckvetmanual.com/dog-owners/brain-spinal-cord-and-nerve-disorders-of-dogs/nervous-system-disorders-and-effects-of-injuries-in-dogs). Merck Veterinary Manual. 3. [Complete blood count-derived inflammatory markers in canine cerebrovascular accidents: diagnostic utility and prognostic implications](https://pubmed.ncbi.nlm.nih.gov/42100222/). Frontiers in veterinary science, 2026. 4. [Blood Clots and Aneurysms in Dogs - Dog Owners](https://www.merckvetmanual.com/dog-owners/heart-and-blood-vessel-disorders-of-dogs/blood-clots-and-aneurysms-in-dogs). Merck Veterinary Manual. 5. [Case Report: Post-stroke hemorrhagic infarction in a status epilepticus Beagle dog](https://pubmed.ncbi.nlm.nih.gov/41960357/). Frontiers in veterinary science, 2026. ## Further Reading - [American Veterinary Medical Association: First Aid Tips for Pet Owners](https://www.avma.org/resources-tools/pet-owners/emergencycare/first-aid-tips-pet-owners) - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information)