Dog Bloodwork Explained: CBC, Chemistry Panel and What Results Mean

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

Blood tests give a snapshot of how your dog's organs are working, and they are one of the most useful tools in veterinary medicine.

Why vets run bloodwork

• Illness investigation when a dog is unwell
• Pre-anesthetic screening. See dog anesthesia safety
• Wellness screening in seniors and at-risk breeds. See senior dog checkups
• Monitoring long-term medication or disease
• Establishing a baseline when healthy

Complete blood count (CBC)

• Red blood cells, hemoglobin and hematocrit: carry oxygen. Low values indicate anemia. See anemia in dogs
• White blood cells: immune defenders. High counts suggest infection, inflammation or stress. Low counts can occur with some viruses or bone marrow disease
• Platelets: help clotting. Low levels can cause bleeding. Tick-borne disease and immune conditions are common causes

Chemistry panel

• BUN and creatinine: kidney function markers. See kidney disease in dogs
• ALT, ALP, AST, GGT and bilirubin: liver and bile duct values. See liver disease in dogs
• Glucose: blood sugar. See diabetes in dogs
• Total protein, albumin and globulin: protein levels that reflect liver, gut, kidney and immune status
• Calcium, phosphorus and electrolytes: sodium, potassium and chloride, which affect nerves, muscles and heart
• Cholesterol and triglycerides: can rise with hormonal and metabolic conditions
• Amylase and lipase: may rise in pancreatitis. See pancreatitis in dogs

Other tests

• Thyroid tests (T4). See hypothyroidism in dogs
• SDMA for early kidney changes
• Urinalysis to check kidney concentration, infection and crystals
• Clotting tests
• Bile acids
• Heartworm and tick tests

Reading results

Labs print reference ranges, and flagged values are marked high or low. But normal ranges are statistical, and individual dogs can fall slightly outside the range without disease. Breed also matters: for example, greyhounds have naturally higher red cell counts and lower platelets. Your vet interprets numbers alongside your dog's signs, exam and trends over time.

Preparing for a blood draw

Ask whether your dog should fast, since fatty meals can cloud samples and affect glucose and triglyceride results. Keep water available, and keep your dog calm so stress does not alter values.

What happens if something is abnormal

Your vet may repeat the test, add targeted tests, run imaging or begin treatment. Mild changes may simply be monitored. Always ask what the abnormal value could mean and what the next steps are.

Tracking trends

Keep copies of every result. A value that is slowly creeping up over several years can be more informative than a single reading. See how to prepare for a vet visit.

Costs

Costs vary by panel and clinic. Ask about wellness packages, and plan for baseline bloodwork in young adults. See dog vet cost guide.

Questions to ask your vet

Ask which results are abnormal, how concerned you should be, whether to repeat or add tests and how often to recheck. Ask for a printout.

Common mistakes

• Comparing against internet ranges
• Panicking over a mild change
• Not asking about trends
• Skipping rechecks

Troubleshooting

• My dog's ALT is slightly high: ask about repeating or adding bile acids.
• I do not understand my results: ask for a walkthrough.
• Different labs give different ranges: compare numbers from the same lab.

A simple plan

1. Fast if advised.
2. Review results with your vet.
3. Follow up on abnormalities.
4. Keep records.

Real-life examples

A senior's bloodwork reveals early kidney changes, and diet starts early. A young dog's baseline helps interpret later results. A retriever's low platelets lead to a tick test. Context matters.

Using results wisely

Bloodwork guides decisions but does not replace an exam.

The takeaway

Bloodwork is a snapshot, best read with exam findings and trends. Ask your vet to explain results.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.