Companion Animal Obesity and Weight Management

Pet obesity is one of the most prevalent welfare problems in companion animals — excess weight causes pain, disease, and shortened lifespans, yet remains normalised by many owners.

Key Facts

Approximately 50–60% of pet dogs and cats in the USA and UK are overweight or obese, according to veterinary body condition assessments
Obesity is causally linked to arthritis, diabetes, urinary disease, respiratory compromise, heart disease, and shortened lifespan in dogs and cats
A landmark PPET study showed that lean dogs lived approximately 1.8 years longer than their overweight siblings — a significant lifespan extension
Many owners misperceive their pet's weight — studies show owners significantly underestimate body condition scores compared to veterinary assessments
Common causes include overfeeding treats, calorie-dense commercial diets, insufficient exercise, and normalisation of overweight body condition
Body condition scoring (BCS) on a 5 or 9-point scale allows owners and vets to assess weight objectively — ribs should be easily palpable without pressing
Gradual weight loss of 1–2% body weight per week, achieved through calorie reduction and increased activity, is the medically recommended approach

Welfare Considerations

Obesity causes chronic suffering. Overweight dogs and cats are in pain from arthritis exacerbated by excess body weight, struggle to breathe normally, and have reduced ability to engage in the play and social behaviours that contribute to their well-being. The welfare irony is that owners who overfeed their pets out of love are inadvertently causing them harm and shortening their lives. Normalising overweight body condition — "he's just fluffy" or "she has big bones" — prevents recognition of a welfare problem that is both serious and addressable. Veterinary support for weight management programmes, combined with owner education, is one of the highest-impact interventions in companion animal preventive health.

What You Can Do

Learn to body condition score your dog or cat — videos and guides from WSAVA and BSAVA are freely available online
Measure food portions using a kitchen scale rather than estimating — most owners significantly overfeed
Count treat calories in your pet's daily total — treats frequently account for 20–30% of daily intake in over-fed pets
Discuss a structured weight loss plan with your vet if your pet is overweight — veterinary-supervised plans achieve better outcomes than owner-led attempts
Increase exercise gradually and consistently — even 10 extra minutes of active play per day contributes to weight management
Do not share human food with pets, particularly high-fat items — table scraps are a common source of excess calories
Support public awareness campaigns about pet obesity — veterinary bodies including PDSA and PFMA run annual pet obesity surveys