Dog Weight Loss Calculator
Build a safe, vet-approved weight loss plan for your dog with realistic targets and calorie-controlled portions.
What Is the Dog Weight Loss Calculator?
Build a safe, vet-approved weight loss plan for your dog with realistic targets and calorie-controlled portions.
Over 55% of dogs are overweight. Excess weight shortens lifespan, worsens joint disease, and increases disease risk. This calculator builds a safe, science-based weight loss programme with weekly targets and adjusted daily food portions.
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
For weight loss, we use the target weight (not current weight) in the RER formula — 70 x (target weight)^0.75. This calculates the calories needed to maintain the target weight rather than the current weight, creating a calorie deficit. We then apply a further 0.8 multiplier (80% of target maintenance) to accelerate loss safely.
Weekly loss rate is expressed as a percentage of current bodyweight. At 1.5% per week, a 30kg dog loses approximately 450g weekly — safe, gradual, and sustainable. Faster than 2% risks muscle loss and nutritional deficiency. The estimated timeline assumes consistent adherence to the new portion.
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:
- WSAVA Body Condition Score Guidelines — Body condition scoring system and ideal weight assessment
- Merck Veterinary Manual u2014 Obesity — Canine weight management and body condition reference
⚠️ These calculators are reference tools only. Always consult a licensed veterinarian before administering medication or making medical decisions.