The PDSA's PAW Report tracks a real, growing problem in the UK

The PDSA's annual PAW (PDSA Animal Wellbeing) Report has repeatedly found that around 1 in 3 UK dogs is overweight or obese, with owners consistently underestimating their pet's body condition compared to a vet's assessment. Overfeeding relative to true energy needs, rather than any single "wrong" food, is usually the main driver, which is exactly what this calculator's weight-based approach is designed to correct.

UK vets recommend body condition scoring alongside any formula

Rather than relying on a calorie formula alone, UK veterinary guidance recommends regularly checking body condition by feel: you should be able to feel (but not see) your dog's ribs with light pressure, and see a visible waist from above. If your dog's body condition drifts away from this regardless of what this calculator suggests, adjust the portion and consult your vet rather than following the number rigidly.