Obesity in Cats: A Deep Welfare Guide
Scale of the Problem
Surveys suggest 40-60% of pet cats in developed countries are overweight or obese, making feline obesity the most prevalent nutritional problem in companion animals. Obesity is defined as body weight more than 20% above ideal; overweight as 10-20% above ideal. Despite its prevalence, many owners do not recognise their cat as overweight, often perceiving 'normal' weight cats as thin. Veterinary body condition scoring at every consultation is essential for early identification.
Health Consequences of Feline Obesity
Feline obesity causes multiple welfare-compromising health conditions: type 2 diabetes mellitus (insulin resistance); hepatic lipidosis (potentially fatal if obese cats stop eating); osteoarthritis and pain (excess weight on joints; overweight cats are significantly more likely to be lame); urinary tract disease (increased risk of FLUTD); reduced grooming ability causing matting and skin problems; reduced activity tolerance; and reduced immune function. Obese cats have significantly shorter lifespans.
Causes and Prevention
Primary causes: overfeeding (free-choice feeding of energy-dense food); lack of physical activity (indoor-only cats); spaying/neutering (reduces metabolic rate by ~20-30%); and breed predisposition (British Shorthair, Ragdoll, non-pedigree domestic cats). Prevention is far easier than treatment: body condition scoring at every vaccination, adjusting food portions as cats age and activity levels change, and switching to measured meals (rather than free feeding) after neutering.
Weight Loss Management
Weight loss in cats must be gradual (1-2% of body weight per week maximum) to avoid hepatic lipidosis. Commercial veterinary weight management diets (high protein, high fibre, reduced fat, restricted calorie) are more effective than reduced portions of regular food. A specific target weight and weight loss timeline should be established. Regular weigh-ins (monthly minimum) monitor progress. Increasing play activity promotes muscle mass retention during weight loss.
Welfare Monitoring During Weight Loss
Cats undergoing weight reduction require monitoring for food aversion and diet refusal (which can trigger hepatic lipidosis). Sudden appetite loss during a weight loss programme requires urgent veterinary attention. Owner education is essential: cats should not go more than 24-48 hours without eating. Quality of life improvements with weight loss (improved activity, play, grooming, reduced pain) reinforce owner motivation and are important welfare outcomes to celebrate.