What Does Hemoglobin Mean in Dogs and Cats?
Quick answer
Hemoglobin is the protein inside red blood cells that carries oxygen. It usually moves together with hematocrit and red cell count. Low hemoglobin indicates anemia, while a high value usually reflects dehydration. Some sample problems, like fat in the blood or damaged cells, can make hemoglobin readings look falsely high.
What is Hemoglobin?
Hemoglobin binds oxygen in the lungs and releases it to tissues.
Reference range
[Range pending sourced table] Reference ranges vary by lab and species. Use the range printed on your pet's report.
What can raise Hemoglobin
- Dehydration
- Fatty sample (false high)
- Damaged cells in sample
What can lower Hemoglobin
- Anemia from any cause
- Iron deficiency from chronic blood loss
Dogs vs cats
In dogs
Chronic blood loss in dogs, such as from parasites, can lower hemoglobin.
In cats
Cats have lower normal hemoglobin than dogs.
Why one value rarely tells the whole story
Hemoglobin rarely adds new information unless it disagrees with hematocrit. Hydration, recent meals, stress during the visit, medications, and how the sample was handled can all shift a result. Vets look at the whole panel, your pet's symptoms, and the trend across tests over time.
Conventional interpretation
Vets compare hemoglobin with hematocrit and red cell indices.
Whole-pet context
Look for pale gums or tiring easily.
Supportive options are not a cure. Check with your veterinarian before adding any supplement.
Questions to ask your vet
- Do hemoglobin and hematocrit agree?
- Could sample quality affect this?
- How does this compare with my pet's previous results?
Frequently asked questions
Is low hemoglobin the same as anemia?
- It is one sign of anemia, read with other red cell values.
Can a fatty meal affect results?
- Fat in the sample can interfere with hemoglobin readings.
What is a normal Hemoglobin range?
- Reference ranges vary by laboratory, analyzer, and species. Use the range printed on your pet's report and ask your vet how your pet's result compares.
Should Hemoglobin be rechecked?
- Your veterinarian decides based on how far from range the value is, your pet's symptoms, and other results. Trends over time are often more useful than one result.
Related lab values
Related guides
Educational support only. Not a diagnosis or substitute for veterinary care.
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