Dog Vertebral Heart Score Calculator
Calculate Vertebral Heart Score (VHS) from thoracic radiograph measurements to assess cardiac size in dogs.
What Is the Dog Vertebral Heart Score Calculator?
Calculate Vertebral Heart Score (VHS) from thoracic radiograph measurements to assess cardiac size in dogs.
Vertebral Heart Score (VHS) is the standard objective method for assessing cardiac size on thoracic radiographs in dogs. It compares the long axis and short axis of the cardiac silhouette to vertebral body length, providing a number that can be compared to breed-specific normal ranges to detect cardiomegaly.
Every result is based on published veterinary research and breed-size-specific growth data — not generic averages. This tool is completely free, works instantly in your browser, and requires no account or sign-up.
How to Use This Calculator
Fill in the required fields above — typically your dog's weight, age, or breed size. Every field has a clear label and hint.
Press the calculate button to get your instant result. No page reload, no account needed, no waiting.
Your result appears immediately below the calculator. It includes the primary answer plus additional context where relevant.
Share, print, or save your result. Always discuss health-related results with your veterinarian before making decisions.
How It Works
The VHS method (Buchanan & Bücheler 1995) measures the long axis (L) from the ventral border of the left mainstem bronchus to the cardiac apex, and the short axis (S) at right angles to L at the widest point. Both measurements are transferred to the vertebral column starting at T4 and expressed as the sum in vertebral body units. Normal for most breeds is 8.5–10.5v. Certain breeds have higher normal VHS — Labrador Retrievers, Cavalier King Charles Spaniels, Boxers, and many others have published breed-specific norms.
Sources: Buchanan JW, Bücheler J. Vertebral scale system to measure canine heart size in radiographs. JAVMA 1995; Cornell CC et al. Allometric scaling of M-mode cardiac measurements in normal adult dogs. J Vet Intern Med 2004.
Veterinary Research
Every formula is derived from peer-reviewed veterinary studies and clinical guidelines, not guesswork or generic rules.
Instant Results
No page reload, no waiting, no account needed. Enter your details and your result appears immediately.
100% Private
All calculations happen in your browser. Nothing you enter is ever stored on our servers or shared with anyone.
Always Free
Every calculator on Doggy Calculators is and will always be completely free to use — no premium tier, no catch.
Frequently Asked Questions
Sources & References
This calculator's formulas are based on the following peer-reviewed and authoritative veterinary sources:
- Merck Veterinary Manual u2014 Clinical Reference — Clinical formulas, normal reference ranges, and diagnostic criteria
- WSAVA Guidelines for Veterinary Practice — International veterinary clinical standards
- Ettinger's Textbook of Veterinary Internal Medicine — Advanced clinical reference for fluid therapy, haematology, and diagnostics
- RECOVER Initiative u2014 CPR Guidelines — Emergency drug dosing and resuscitation protocols
⚠️ These calculators are reference tools only. Always consult a licensed veterinarian before administering medication or making medical decisions.