How old is your dog
really?
Your dog's birthday tells you how long they've been alive. Their bloodwork tells you how fast they're aging. We built a biological age calculator based on a 12-year longitudinal study of 829 dogs — and it's free.
Biological Age
Ned · Australian Labradoodle · 9 years old
~7.9
years biological
vs 9.7 years actual
Pulling younger
Worth watching
Missing
Creatine Kinase
Ask your vet to add CK on the next panel
Ned is 9 years old.
His blood says he's aging like a 7.9-year-old. That's what this tool measures.
12 years of data.
829 dogs. 10 markers.
In 2024, researchers at Nestlé Research published a biological age algorithm in GeroScience — trained on longitudinal bloodwork from 829 dogs tracked over 12 years. They found that 10 routine blood markers, weighted by their association with mortality risk, predict biological age with a Pearson correlation of 0.98 to chronological age.
The key finding: dogs whose biological age exceeded their chronological age by more than 1 year had a 75% higher mortality risk (hazard ratio = 1.75, p = 3.7×10⁻⁶). And in nearly half of those dogs, no single marker was outside its reference range — the pattern was only visible when markers were analyzed together.
Read the study on PubMed →Upload bloodwork
Take a photo of your lab report or upload a PDF. Our AI extracts every marker, value, and reference range automatically.
We score it
Each of the 10 longevity markers is z-scored against population averages and weighted by its mortality coefficient from the study.
See your dog's age
Biological age, markers pulling younger, markers to watch, and what's missing — with specific guidance on what to do next.
The 10 markers that matter.
Selected via LASSO-penalized Cox regression with 20-fold cross-validation from an initial panel of 28 parameters. Ranked here by their coefficient weight in the final model — the markers your vet already runs.
Albumin
The single most predictive marker in the model. High albumin strongly correlates with younger biological age. It reflects liver function, nutritional status, and overall metabolic health.
Creatine Kinase
Elevated CK signals muscle tissue breakdown — common in aging and disease. The model ln-transforms this value, meaning small increases have outsized effects on the score.
Alkaline Phosphatase
ALP rises with liver stress, bile duct issues, and bone metabolism changes. Also ln-transformed — the algorithm weights early elevations heavily.
Globulin
High globulin indicates chronic immune activation or inflammation — the body fighting something over time. Common in senior dogs with subclinical infections.
MCH
Mean corpuscular hemoglobin measures how much oxygen each red blood cell carries. Low MCH pulls toward older biological age.
WBC
White blood cell count reflects immune activity. Elevated WBC — even within the normal range — correlates with accelerated aging in the model.
Hematocrit
The percentage of blood that is red blood cells. Low hematocrit reduces oxygen delivery to tissues and trends with aging.
Glucose
Fasting glucose reflects metabolic regulation. Higher glucose — even within range — is associated with older biological age.
Hemoglobin
Total oxygen-carrying capacity. Declines with age, anemia, and chronic disease. Low hemoglobin signals the body is under stress.
MCV
Mean cell volume measures red blood cell size. Changes in MCV can indicate nutritional deficiencies or bone marrow issues common in aging dogs.
Find out your dog's biological age.
Free. Takes 30 seconds. All you need is a blood panel.
Or join the waitlist for updates:
Biological age is an estimate based on Herzig et al. (2024), “A biological age based on common clinical markers predicts health trajectory and mortality risk in dogs,” GeroScience47(1):45-59. This tool is for informational purposes only and is not a substitute for veterinary care. Always consult your veterinarian before making changes to your dog's diet or health protocol.