Is My Dog or Cat Overweight? Find Out Now.

How to Tell If Your Pet Is Overweight

Pet obesity is one of the most common health issues in dogs and cats — over 50% of pets in the US are overweight or obese. Extra weight puts stress on joints, increases the risk of diabetes, heart disease, and respiratory problems, and can shorten your pet's lifespan by up to 2 years. The good news is that weight management is one of the most impactful things you can do for your pet's health.

The most reliable way to assess your pet's weight is the Body Condition Score (BCS) — a 9-point scale that evaluates fat coverage over the ribs, spine, and waist. Our calculator above helps you determine your pet's BCS and ideal weight range based on breed standards. You can also check at home: you should be able to feel your pet's ribs easily without pressing hard, see a visible waist behind the ribs when viewed from above, and see a tucked-up abdomen when viewed from the side.

Health Risks of Pet Obesity

Carrying excess weight significantly increases your pet's risk of:

• Diabetes mellitus: Obese cats are 4 times more likely to develop diabetes
• Osteoarthritis: Extra weight accelerates joint degeneration, especially in large breeds
• Heart disease: Increased cardiac workload leads to earlier heart failure
• Respiratory problems: Fat around the chest makes breathing harder, especially in flat-faced breeds
• Certain cancers: Obesity is linked to increased cancer risk in both dogs and cats
• Reduced lifespan: Studies show lean dogs live 1.8–2 years longer than overweight dogs

Treating these conditions can cost thousands — see our pet diseases guidefor cost breakdowns of each condition.

Creating a Weight Loss Plan for Your Pet

Safe weight loss for pets should be gradual — no more than 1–2% of body weight per week. Crash diets can cause hepatic lipidosis (fatty liver), especially in cats. The key components of a weight loss plan include:

• Calorie reduction: Feed 70–80% of your pet's current caloric intake, measured precisely with a kitchen scale
• Increased activity: Add 10–15 minutes of active play or walking per day
• Prescription weight loss food: High-protein, high-fiber formulas help pets feel full on fewer calories — see prescription food costs
• Regular weigh-ins: Check weight every 2 weeks and adjust the plan as needed
• Treat reduction: Treats should be no more than 10% of daily calories — replace with vegetables like green beans or carrots

Our Healthy Weight Calculator gives you a personalized calorie target and weight loss timeline. For pets that need professional guidance, a veterinary nutritionist consultation costs $200–$500 — see our nutrition consultation cost guide.