Obesity affects 25-40% of dogs in the UK and US, making it the most prevalent nutritional disorder in companion dogs. Its welfare impact—chronic pain, reduced mobility, and associated diseases—demands serious attention from veterinarians and owners alike.
Obese dogs face multiple welfare compromises: increased osteoarthritis pain and severity from excess joint loading; increased risk of type 2 diabetes; respiratory compromise from thoracic fat limiting lung expansion; exercise intolerance reducing behavioural welfare; increased surgical and anaesthetic risk; skin fold infections in obese breeds; and reduced lifespan (approximately 1.8 years shorter in obese dogs compared to lean-body-weight matched dogs in Labrador studies).
The Body Condition Score (BCS) 1-9 scale provides standardised obesity assessment beyond body weight. At BCS 5-6 (ideal), ribs are easily palpable under a thin fat layer, waist visible, abdominal tuck present. BCS 7+ indicates overweight; BCS 8-9 indicates obesity. Regular BCS assessment enables early identification of weight gain before obesity establishes. Many owners normalise overweight body condition because it is familiar—veterinary education addressing this misperception improves early intervention rates.
Safe weight loss in dogs targets 1-2% body weight per week. Caloric intake set at 60-80% of maintenance energy requirement for the target bodyweight initiates weight loss without metabolic compromise. Maintaining high protein intake prevents muscle mass loss during weight reduction. Veterinary-supervised programmes with monthly weigh-ins and diet adjustments achieve better outcomes than owner-managed weight loss. Commercial prescription weight management diets provide appropriate nutrient density with reduced caloric content.
Increased activity complements dietary restriction during weight management. For dogs with concurrent OA, low-impact exercise (hydrotherapy, lead walking on soft surfaces) maintains cardiovascular fitness and muscle mass without excessive joint loading. Puzzle feeders provide mental enrichment while slowing food consumption rate. Owner engagement in structured exercise programmes improves both adherence and dog-owner bonding during what can be a challenging management period.