Obesity and Weight Management

Weight management is distinct from simply noting a dog is obese - it describes the active process of assessing, setting targets, and systematically moving a dog to and maintaining a healthy weight.

This guide is specifically about the management process: how to monitor progress, what to log, and how to sustain a healthy weight long-term. For background on obesity as a condition and its health consequences, see the Obesity guide.

Establishing the baseline

Before starting a weight loss programme, three things are needed:

Current weight. Weigh on the same scales at the same time of day (first thing in the morning, before food). Your vet's practice scales are most accurate; if weighing at home, use a consistent set of scales.

Body condition score. A BCS of 5/9 is ideal. Assess by feel: can you feel the ribs easily with gentle pressure? Is there a visible waist from above? A slight abdominal tuck from the side? Log the score.

Target weight. Your vet or veterinary nurse will calculate a target weight based on the dog's breed, frame size, and BCS. For most dogs, the target is to reach a BCS of 4–5. This typically means losing 15–20% of body weight for obese dogs.

Calculating calorie needs

Calorie calculation should be done with your vet or using a validated tool. The key variables:

• Resting Energy Requirement (RER): Based on body weight; the calories needed for basic metabolic functions
• Life stage factor: Modified for age, neuter status, activity
• For weight loss: Typically aim for 80% of the calories calculated for the target weight (not the current weight)

Measure food by weight or a measured cup - never by eye or "a handful."

What to log for active weight loss

Weekly (during active weight loss phase):

• Body weight
• BCS (monthly is sufficient for BCS)
• Food type, daily portion (weighed)
• All treats - type and quantity
• Approximate daily exercise (walk duration)

Critical log entries:

• Any deviation from the plan - a treat given, food stolen, table scrap eaten
• Any change in the food brand or formulation (caloric density varies)
• Signs of hunger (begging, restlessness, eating grass)

The most common reason weight loss programmes fail is underestimated treat calories. Training treats, dental chews, flavoured toppers, and table scraps can easily account for 30–50% of a dog's daily calorie intake. Log everything.

Rate of progress

Target weight loss of 1–2% of body weight per week:

• A 30kg dog should lose approximately 300–600g per week
• A 10kg dog should lose approximately 100–200g per week

Faster than this risks hepatic lipidosis; slower may indicate the calorie count is higher than thought.

Plot the weight on a graph over time - a trend line makes progress (and plateaus) far more visible than individual numbers.

Managing plateaus

Weight loss plateaus are common and occur because the body adjusts its energy expenditure as weight falls. Strategies:

• Verify the actual calorie content of the food being fed - formulations change, and caloric density varies between batches and brands
• Recheck that all treats and extras are being counted
• Consider increasing exercise if the dog's joints and fitness allow
• Discuss with your vet whether a small further reduction in calories is appropriate (don't reduce by more than 10% at a time)

Transition to maintenance

Once target weight is reached, daily calorie intake needs to increase slightly to maintain weight rather than continue losing. This transition is important - without adjustment, a dog who reaches their target will continue to lose weight.

Continue monthly weighing indefinitely. Weight regain is common if monitoring stops - the habits that caused obesity don't disappear with weight loss.

Addressing hunger

Dogs on restricted calories often seem hungry - some breeds (Labradors, Beagles) are genetically predisposed to food-seeking regardless of satiety. Strategies to manage hunger without adding calories:

• Split the daily ration into three or four smaller meals instead of one or two
• Switch to a high-fibre weight management food - fibre adds physical bulk without calories
• Use puzzle feeders to extend meal duration
• Low-calorie vegetables (plain cucumber, carrot, broccoli) as treats

Exercise

Exercise supports weight loss but has a smaller caloric effect than most owners expect - a 20kg dog burns approximately 25–30 kcal per 30 minutes of walking. Exercise is more valuable for metabolic health, muscle retention, and quality of life than as a primary calorie-burning strategy.

Start exercise increases gradually, particularly in dogs with concurrent joint disease - increased activity should parallel weight reduction rather than precede it.

When to contact your vet

Schedule a routine appointment to:

• Set up a formal weight management programme with a veterinary nurse
• Weigh-in every 4–6 weeks during active weight loss
• Investigate if weight loss isn't occurring despite apparent adherence to the plan
• Transition from active loss to maintenance

Frequently Asked Questions

My vet says my dog needs to lose weight but they seem fine. Is it really that important? Excess body weight is directly linked to shorter lifespan, development of diabetes, worsening of joint disease, reduced exercise tolerance, and increased surgical risk. A dog who seems fine is not immune to these effects - they develop over time. Reaching and maintaining a healthy weight is the single most impactful health decision for an overweight dog.

Can I use regular dog food for weight loss, or do I need a special diet? Regular dog food can be used if the portion is calculated carefully to provide the right calorie restriction. However, at a significantly reduced portion, the dog may not receive adequate fibre, which increases hunger. Weight management foods provide higher fibre content at the appropriate calorie level, making the restriction more tolerable.

My dog won't eat the weight management food. What do I do? Transition slowly - mix the new food with the old at an increasing ratio over 7–10 days. Adding warm water, low-sodium broth, or a small amount of a palatable topper (counted within the daily calorie allowance) can help. If acceptance remains poor, discuss alternative low-calorie foods with your vet.

How do I stop other family members from feeding the dog extra? Agreement and awareness across the household is essential. A shared log that all family members add to makes it visible when treats have already been given. Designating a single person to feed on scheduled times reduces opportunities for additional feeding.

My dog reached their target weight - what now? Maintain monthly weighing. The transition to maintenance calories should be made gradually. Continue with the logging habits that got them there - the dog's weight will creep back if monitoring lapses.