How much to feed
How do I calculate calories for a mixed breed dog of unknown standard?
Last updated 23 September 2026 · How we write and check this
Short answer
Use your dog's actual current body weight in the resting energy formula, 70 times weight in kilograms to the power of 0.75, regardless of breed mix, since the calculation is based on weight and activity rather than on knowing a breed standard. Breed only matters for adjusting the activity multiplier, based on how genuinely active your specific dog is, not for the base calculation itself.
Why breed identity is not required
The resting energy formula works from a dog's actual measured weight, so it applies equally well to a purebred dog and a mixed breed dog of completely unknown ancestry.
This means not knowing your dog's exact breed mix is not a barrier to calculating an accurate starting feeding amount, since the formula never actually requires that information.
Where breed knowledge would help, and how to work around it
Knowing a breed can sometimes hint at likely activity level or build, such as expecting a herding type mix to be more active than a giant breed mix, but this is only a rough guide, not something the calculation strictly needs.
Instead of guessing from appearance, judge your specific dog's actual behavior: how much it moves in a typical day, how lean or stocky its build looks, and how it responds to the calculated starting amount.
Fine tuning without breed information
Start at the standard 1.6 times resting energy multiplier for an average neutered adult, then adjust up or down based on body condition over the following few weeks, exactly as you would for a known breed.
A DNA test can satisfy curiosity about ancestry, but it will not change the feeding calculation, which is driven by your dog's actual weight and observed activity rather than by breed labels or assumptions about typical energy levels for a particular look, coat type, or breed reputation.
Key takeaways
- The resting energy formula uses actual body weight and works regardless of known breed identity.
- Breed mix can hint at likely activity level but is not required for an accurate starting calculation.
- Judge your dog's real activity and build directly rather than relying on assumptions from appearance.
- Adjust from the standard starting multiplier based on body condition, the same process used for any dog.