What Does Blood Work Show in Dogs?
Blood work can reveal changes happening inside your dog’s body that may not be obvious from their appearance or a physical exam alone. It can give your veterinarian important information about blood cells, organ function, hydration, blood sugar, electrolytes, hormones, and more.
Different blood tests look at different parts of your dog’s health. A complete blood count, or CBC, evaluates red blood cells, white blood cells, and platelets, while a blood chemistry panel provides information about organs such as the kidneys and liver along with glucose, proteins, electrolytes, and other substances in the bloodstream.
One abnormal result does not always point to one specific condition. Veterinarians interpret blood work alongside your dog’s symptoms, medical history, medications, physical exam, and any other diagnostic testing that may be needed.
At Good Dog Veterinary Care, our all-dog veterinary teams can recommend appropriate blood testing based on your dog’s symptoms, age, medical history, or preventive care needs and help you understand what the results mean. Reach out to one of our three Georgia-area practices:
1. Anemia and Other Red Blood Cell Changes
Red blood cells carry oxygen throughout your dog’s body. A CBC measures the number of red blood cells along with values such as hemoglobin and hematocrit, which help veterinarians understand how effectively the blood is carrying oxygen.
Low red blood cell levels may indicate anemia. Depending on the cause, dogs with anemia may appear weak, tired, pale, or less interested in normal activity.
Blood work can also show whether your dog appears dehydrated, since dehydration can make red blood cell concentrations look higher. In some cases, veterinarians can evaluate immature red blood cells called reticulocytes to determine whether the body is actively producing replacement cells.
2. Infection, Inflammation, and White Blood Cell Changes
White blood cells are part of your dog’s immune system. A CBC looks at the total number of white blood cells as well as different types, including neutrophils, lymphocytes, monocytes, and eosinophils.
Changes in these cells can provide clues about infection, inflammation, allergies, parasites, stress, or immune related conditions. For example, eosinophils may change with certain allergic or parasitic conditions, while other white blood cell patterns may suggest inflammation or infection.
A high or low white blood cell count does not automatically tell your veterinarian exactly what is wrong. Instead, it helps narrow down the possibilities and determine whether other testing may be needed.
3. Platelets and the Blood’s Ability to Clot
Platelets are blood cells that help form clots and control bleeding. A CBC measures the number of platelets circulating in your dog’s blood.
A low platelet count can raise concerns about abnormal bleeding or the body’s ability to clot properly. This can be especially important if your dog is bruising, bleeding unexpectedly, or preparing for surgery.
If platelet levels or symptoms raise concerns, your veterinarian may recommend additional testing to evaluate clotting function or determine why the platelet count is abnormal.
4. Kidney Function
Blood chemistry panels include several values that can provide information about kidney function.
Two commonly discussed markers are blood urea nitrogen, or BUN, and creatinine. Veterinarians may also consider phosphorus, electrolytes, hydration status, and other findings when evaluating the kidneys.
Abnormal kidney related values do not necessarily mean your dog has kidney disease. Dehydration, urinary obstruction, medications, and other medical problems can affect some of the same results.
If kidney values are abnormal, your veterinarian may recommend a urinalysis, repeat blood work, imaging, or other testing to better understand what is happening.
5. Liver and Gallbladder Health
Blood work can also reveal changes involving the liver and biliary system.
A chemistry panel may measure enzymes and substances such as ALT, ALP, AST, GGT, and bilirubin. Veterinarians may also consider albumin, total protein, and other values when evaluating liver function.
Elevated liver enzymes can be an important clue, but they do not automatically mean a dog has a specific liver disease. Some values can change because of medications, hormonal disorders, inflammation, or problems elsewhere in the body.
When results are abnormal, additional blood testing, imaging, or other diagnostics may be necessary to determine the cause.
6. Blood Sugar and Diabetes
Glucose is your dog’s blood sugar, and abnormal glucose levels can provide important information about metabolic health.
Persistently high blood sugar may raise concerns about diabetes mellitus, particularly when it occurs alongside symptoms such as increased thirst, increased urination, weight loss, or appetite changes. Low blood sugar can also be significant and may occur with several different medical conditions.
One abnormal glucose result does not always confirm diabetes. Your veterinarian may recommend repeat testing, a urinalysis, or additional laboratory work before making a diagnosis.
Dogs showing symptoms associated with high blood sugar can also be evaluated for diabetes in dogs.
7. Hydration, Electrolytes, and Mineral Balance
Blood work can tell your veterinarian much more than whether your dog is simply hydrated or dehydrated.
Chemistry panels may measure sodium, potassium, chloride, calcium, and phosphorus. These electrolytes and minerals are involved in processes ranging from nerve and muscle function to fluid balance and organ health.
Vomiting, diarrhea, kidney disease, urinary problems, dehydration, and some endocrine disorders can all affect electrolyte levels. Significant abnormalities may require prompt treatment, depending on which values are affected and how your dog is feeling.
Your veterinarian will usually interpret these values as a group rather than focusing on one electrolyte by itself.
8. Protein Levels and What They Can Reveal
A blood chemistry panel may measure total protein along with specific proteins such as albumin and globulins.
These values can provide clues about hydration, liver function, inflammation, immune activity, and whether the body may be losing protein through the kidneys or digestive tract.
For example, albumin is produced by the liver, but low albumin does not automatically mean liver disease. Protein can also be lost through the kidneys or intestines, which is why abnormal protein levels may lead to additional testing.
Protein results can be especially helpful when they are interpreted alongside kidney values, liver values, urine testing, and your dog’s symptoms.
9. Pancreas and Digestive System Problems
Blood work can provide clues when a dog is experiencing vomiting, diarrhea, abdominal discomfort, appetite changes, or other digestive symptoms.
Routine chemistry panels may include enzymes related to the pancreas, while more specialized gastrointestinal or pancreatic blood tests may be ordered when conditions such as pancreatitis, malabsorption, or other digestive disorders are suspected.
Blood protein levels may also provide useful information if your veterinarian is concerned that protein is being lost through the digestive tract.
Routine chemistry results alone usually cannot confirm every pancreatic or gastrointestinal condition, so additional blood tests, imaging, or other diagnostics may be needed.
10. Thyroid and Adrenal Hormone Disorders
Blood samples can also be used for hormone testing when an endocrine disorder is suspected.
Thyroid testing may measure hormones such as T4 when your veterinarian is evaluating your dog for hypothyroidism.
Cortisol testing and other specialized tests may be used when conditions such as Addison’s disease or Cushing’s disease are being investigated.
These conditions are a good example of why “blood work” is not one single test. A routine chemistry panel may raise suspicion that something is wrong, but specialized hormone testing is often needed to confirm an endocrine diagnosis.
11. Heartworm, Tick Borne Diseases, and Other Infections
Certain infectious diseases are diagnosed or screened for using targeted blood tests.
Heartworm testing uses a blood sample to look for evidence of heartworm infection. Blood based screening may also be used for tick borne diseases such as Lyme disease, ehrlichiosis, and anaplasmosis, depending on the specific test being performed.
These tests are separate from a routine CBC or chemistry panel. Your dog does not automatically receive screening for every infectious disease simply because blood was drawn.
Your veterinarian may recommend specific testing based on your dog’s symptoms, preventive care history, travel, lifestyle, and potential exposure.
12. Cancer, Blood Disorders, and Other Serious Conditions
Blood work can sometimes reveal abnormalities that raise concern for cancer, blood disorders, or other serious diseases.
For example, certain blood cancers such as leukemia can cause abnormal white blood cells or unusual cell counts. Chronic illnesses and some cancers may also contribute to anemia, changes in proteins, abnormal calcium levels, or other laboratory abnormalities.
Blood work is also frequently used to monitor dogs receiving cancer treatment and make sure organs and blood cell counts are tolerating therapy appropriately.
However, routine blood work generally cannot confirm or rule out cancer on its own. Abnormal results may tell your veterinarian that something needs further investigation, but diagnosis may require imaging, cytology, biopsy, specialized testing, or other diagnostics.
Understanding What Your Dog’s Blood Work Really Means
Blood work can reveal changes involving your dog’s blood cells, kidney and liver function, blood sugar, electrolytes, proteins, hormones, hydration, clotting, pancreatic and digestive health, infectious diseases, and certain blood disorders.
The important part is understanding that these values do not exist in isolation. An abnormal result may be significant, or it may be influenced by dehydration, stress, medications, age, or another condition. Your veterinarian looks at the pattern of results alongside your dog’s symptoms, medical history, and physical exam before deciding what the findings may mean.
If your dog is experiencing unusual symptoms, needs monitoring for an existing condition, or your veterinarian recommends routine blood work, Good Dog Veterinary Care can perform appropriate testing and help you understand what the results mean. Reach out to one of our three Atlanta area practices:
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