Dog BMI Calculator
Calculate your dog's Body Mass Index and assess their weight status with breed-specific ranges
Calculate Dog's BMI
Current weight of your dog
Measure from ground to shoulder (withers)
Select your dog's breed for accurate healthy range comparison
BMI Results
Breed: Mixed Breed/Other
Formula: BMI = Weight (lbs) ÷ Height (inches)
Measurements: 0 lbs, 0 inches
Status:
Weight Management Recommendations
Maintain current diet and exercise routine
Monitor weight regularly
Continue with balanced nutrition
Ensure adequate daily exercise
Regular veterinary checkups
Body Condition Score Reference
Use this visual and physical assessment alongside BMI for a complete evaluation of your dog's weight status.
Very Thin
No fat can be felt under the skin. Ribs, hip bones, and spine are clearly visible with noticeable loss of muscle.
Thin
Very little fat can be felt under the skin. Ribs, hip bones, and spine are easily spotted.
Ideal
A small amount of fat can be felt. Ribs, hip bones, and spine are easily felt (not seen!) with a visible waist.
Overweight
A layer of fat is present on the belly and at the base of the tail. Ribs, hip bones, and spine are hard to feel with a barely visible waist.
Obese
There are fat pads on the lower back and the tail base. Ribs, hip bones, and spine are under a thick layer of fat and difficult to feel.
Example Calculation
Samoyed Example (from Omnicalculator)
Dog: Samoyed, 40 lbs, 20.9 inches tall
Calculation: BMI = 40 lbs ÷ 20.9 inches = 1.91
Healthy range for Samoyed: 1.8 - 2.2
Result: This BMI (1.91) is within the healthy range for Samoyeds
Mixed Breed Example
Mixed breed dog: 30 lbs, 15 inches tall
BMI = 30 ÷ 15 = 2.0
Result: BMI 2.0 is within healthy range (≤ 3.0) for mixed breeds
BMI Status Guide
Underweight
Below breed range
Healthy Range
Within breed-specific range
Slightly Overweight
15% above range
Overweight
30% above range
Obese
Significantly above range
Measurement Tips
Measure height at the shoulder (withers), not the head
Weigh your dog when they're calm and still
Measure consistently at the same time of day
Use BMI alongside body condition scoring
Consult vet for weight concerns
Understanding Dog BMI
What is Dog BMI?
Dog Body Mass Index (BMI) is a numerical measure that compares a dog's weight to their height. Unlike human BMI, dog BMI uses breed-specific ranges because different breeds have vastly different body structures and ideal proportions.
Why Use BMI for Dogs?
- •Provides objective weight assessment
- •Accounts for breed-specific body types
- •Helps track weight changes over time
- •Complements visual body condition scoring
BMI Formula
BMI = Weight (lbs) ÷ Height (inches)
This simplified formula is more practical for dogs than the human BMI formula (weight × 703 ÷ height²) and produces more manageable numbers.
Breed Considerations
- Small breeds: Typically BMI 0.2 - 1.6
- Medium breeds: Typically BMI 1.4 - 2.8
- Large breeds: Typically BMI 2.0 - 4.5
- Mixed breeds: General guideline ≤ 3.0
Important: BMI is a screening tool, not a diagnostic tool. Always combine with physical examination and veterinary assessment.