Updated October 31, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Abnormal liver tests discovered around the time of a vaccination can be concerning, but the timing alone doesn’t mean the vaccine injured the liver. There is no established evidence that routine canine vaccines are a common cause of chronic liver disease. Some vaccines protect against infections that can seriously damage the liver.
Why a dog may have abnormal liver results
Liver-associated blood tests may change with various illnesses, medications, gallbladder problems, inflammation or age-related conditions. A high enzyme result doesn’t automatically indicate liver failure. A veterinarian interprets bloodwork together with symptoms, medications and, when needed, further testing such as repeat bloodwork or imaging.
How vaccination can protect liver health
Vaccines against canine adenovirus help prevent infectious canine hepatitis. Leptospirosis is a bacterial infection that can affect the kidneys and liver; the AAHA vaccination guidance was updated in 2024 to categorize leptospirosis vaccine as core for dogs. These benefits should be weighed with each dog’s history and any previous reactions.
Which symptoms deserve care?
Contact a veterinarian if your dog develops jaundice (yellow eyes or gums), persistent vomiting, poor appetite or unusual weakness. Collapse, seizures, major bleeding, severe confusion or difficulty breathing requires emergency care. Sudden facial swelling, hives or breathing difficulty following any injection may indicate an allergic reaction and also warrants urgent attention.
What should you tell the clinic?
Provide the vaccine date, any recent blood test results, current medications and the timeline of symptoms. Ask what evidence supports the suspected cause before altering a vaccination plan. A dog with an established liver disease should have preventive care individualized by their veterinarian, not automatically discontinued.
See emergency signs in canine liver disease and liver changes in older dogs.
Veterinary references
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.