Dog BMI Calculator

Your details

Your dog's body weight. Weigh on a bathroom scale (carry the dog, subtract your own weight) or a vet scale.
kg
Measure from the floor to the top of the shoulder blades (withers) while the dog stands on a flat surface.
cm
Choose the size class that best matches your dog's breed. This adjusts the healthy BMI range because stockier breeds carry more mass per unit height than lean, leggy breeds.
Dog BMIObese
82.6

Weight (kg) divided by height at withers (m) squared

Weight statusObese
Healthy BMI range15 to 18
Ideal weight range4.5 to 5.4 kg
Weight to lose or gain19.6 kg to lose
82.6
Underweight<10Toy ideal10-13Small ideal13-15Medium/Large ideal15-20Overweight20-25Obese25+

Your dog's BMI is 82.6 - obese.

  • The healthy BMI range for a medium (10 to 25 kg) dog is 15 to 18. Your dog's BMI is 82.6.
  • At this height, the ideal weight range is 4.5 to 5.4 kg.
  • Excess weight raises the risk of joint disease, diabetes, and heart problems, and can shorten a dog's life by up to 2 years.
  • BMI is a screening estimate. A veterinarian's hands-on Body Condition Score (BCS) assessment gives a more accurate picture by evaluating visible and palpable fat and muscle.

Next stepSpeak to your veterinarian before changing your dog's diet: they can set a safe target weight and calorie goal based on a full examination.

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