How do I know if my dog is overweight?

Use the Body Condition Score (BCS) test. You should be able to feel your dog's ribs easily without pressing hard. Viewed from above, your dog should have a visible waist behind the ribcage. From the side, there should be an abdominal tuck - the belly should slope upward from the chest to the hind legs. If you cannot feel the ribs, see no waist, or the belly hangs level or below the chest, your dog is likely overweight. Your vet can confirm with a formal BCS assessment.

How fast should a dog lose weight?

A safe rate of weight loss for dogs is 1–2% of body weight per week. For a 70-pound dog, that is roughly 0.7 to 1.4 pounds per week. Faster weight loss can cause muscle loss, nutritional deficiencies, and metabolic problems. Weight loss should always be gradual and monitored by your vet.

Is walking enough exercise for a dog to lose weight?

For most overweight dogs, casual walks alone are not sufficient for meaningful weight loss. Walking is low-intensity and burns relatively few calories. Dogs need sustained aerobic exercise that elevates their heart rate to burn fat effectively. Structured activities like running, swimming, or slatmill sessions are significantly more effective for weight loss than walking at a human pace.

What is the best exercise for an overweight dog?

Low-impact aerobic exercise is ideal for overweight dogs. Slatmill sessions, swimming, and controlled leash jogging are excellent options because they elevate the heart rate and burn calories without putting excessive stress on joints that are already carrying extra weight. Start slowly and build duration and intensity gradually over several weeks.

How many calories should my dog eat to lose weight?

Your vet should calculate your dog's target caloric intake based on their ideal weight, not their current weight. As a general guideline, most weight loss plans target the Resting Energy Requirement (RER) for the dog's ideal body weight, which is roughly 70 × (ideal weight in kg)^0.75 calories per day. Do not guess - work with your vet to set the right number for your dog.

Can certain dog breeds lose weight more easily than others?

Some breeds are genetically predisposed to weight gain and may lose weight more slowly. Labrador Retrievers carry a gene variant (POMC mutation) that increases hunger and reduces satiety. Beagles, Dachshunds, Cocker Spaniels, and Pugs are also prone to obesity. These breeds may require stricter dietary management and more structured exercise to achieve and maintain a healthy weight.

How to Help Your Dog Lose Weight: A Vet-Backed Guide

If your vet has told you your dog needs to lose weight, you are not alone. More than 56% of dogs in the United States are overweight or obese according to the Association for Pet Obesity Prevention. The good news is that canine weight loss is straightforward when you approach it correctly: adjust the diet, increase structured exercise, and track progress consistently. This guide covers exactly how to do each of those things safely and effectively.

Step 1: Confirm Your Dog Is Actually Overweight

Before changing anything, you need to know where your dog stands. Many owners cannot accurately assess their dog's weight by appearance alone, especially with thick-coated or barrel-chested breeds. The most reliable method is the Body Condition Score (BCS), a standardized 1–9 scale used by veterinarians worldwide.

A dog at an ideal BCS of 4–5 has ribs that are easily felt without pressing, a visible waist when viewed from above, and a clear abdominal tuck when viewed from the side. A BCS of 6–7 indicates overweight. A BCS of 8–9 indicates obesity.

You can do a quick check at home right now. Place your hands flat on your dog's ribcage with light pressure. If you can feel each rib individually, your dog is likely at a healthy weight. If you have to press through a layer of padding to feel the ribs, or cannot feel them at all, your dog is carrying excess fat. Schedule a vet visit to get a formal BCS assessment and a target weight to work toward.

Step 2: Calculate the Right Caloric Intake

Weight loss in dogs follows the same basic principle as in humans: calories consumed must be less than calories burned. But you should never guess at the numbers. Work with your veterinarian to calculate a daily caloric target based on your dog's ideal weight, not their current weight.

A commonly used formula is the Resting Energy Requirement (RER): roughly 70 × (ideal body weight in kg) raised to the power of 0.75. Your vet may adjust this based on your dog's age, breed, activity level, and any medical conditions. For most weight loss plans, vets recommend feeding at or slightly below the RER for the target weight.

This number is almost always lower than what the bag of dog food recommends. Feeding guidelines on commercial dog food packaging are designed for active adult dogs at a healthy weight and are often generous. If your dog is overweight, following the bag's recommendations is likely part of the problem.

Step 3: Fix the Diet

Once you have a caloric target, you need to restructure what and how your dog eats. Diet alone accounts for roughly 60–70% of weight loss success. Exercise matters, but you cannot out-exercise a bad diet.

Measure every meal. Use a kitchen scale or standard measuring cup, not an estimate. Eyeballing portions is how most dogs end up overfed. A few extra kibbles per meal adds up to significant excess calories over weeks and months.

Cut the treats. Treats should make up no more than 10% of your dog's daily calories. A single dental chew or bully stick can contain 80–100+ calories, which is a significant portion of a small dog's entire daily budget. Replace high-calorie treats with low-calorie alternatives like baby carrots, green beans, blueberries, or small pieces of plain cooked chicken.

Stop feeding table scraps. Human food is calorically dense and often contains fats and sugars that dogs do not need. Even small amounts of table scraps can significantly offset a carefully calculated diet plan.

Consider a weight management formula. Veterinary weight management diets are formulated to be lower in calories but higher in protein and fiber, which helps dogs feel full while eating less. Ask your vet whether switching to a weight management food makes sense for your dog.

Feed smaller meals more frequently. Splitting the daily food allowance into two or three meals instead of one large meal helps regulate blood sugar, reduces hunger between meals, and may improve metabolic efficiency.

Step 4: Increase Structured Exercise

Diet creates the caloric deficit. Exercise accelerates fat loss, preserves lean muscle mass, and builds the cardiovascular fitness your dog needs to stay healthy long-term. But not all exercise is equal when it comes to weight loss.

Walking is not enough. A casual walk at your pace burns very few calories for most dogs. Walking is great for mental stimulation and bonding, but it does not elevate your dog's heart rate enough to drive meaningful fat burning. Think of walking as the baseline, not the workout.

Aerobic exercise is the goal. Your dog needs sustained activity that gets their heart rate elevated for 20–30 minutes. Running, swimming, vigorous fetch sessions, and structured slatmill training all qualify. The key word is sustained - a few minutes of sprinting followed by 20 minutes of sniffing is not aerobic exercise.

Start slow and build gradually. An overweight dog is at higher risk of overheating, joint injury, and cardiovascular stress during exercise. If your dog has been sedentary, do not start with 30-minute runs. Start with 10–15 minutes of moderate activity and increase duration by no more than 10% per week. Watch for signs of fatigue: excessive panting, slowing down, lying down, or limping.

Low-impact options are ideal for heavy dogs. Slatmill sessions and swimming are excellent choices for overweight dogs because they provide aerobic benefits without the joint impact of running on hard surfaces. A non-motorized slatmill is particularly effective because the dog controls the pace entirely, which means they naturally self-regulate intensity as their fitness improves over time.

Consistency matters more than intensity. Four 20-minute sessions per week will produce better results than one 60-minute session on the weekend. Consistent, moderate exercise builds cardiovascular capacity and metabolic efficiency in ways that sporadic intense activity does not.

Step 5: Track Progress the Right Way

Weigh your dog every one to two weeks, ideally at the same time of day. Write the number down. Do not rely on how your dog looks - visual changes are gradual and easy to miss, especially with thick-coated breeds.

A safe rate of weight loss is 1–2% of body weight per week. For a 60-pound dog, that is roughly 0.6 to 1.2 pounds per week. If your dog is losing faster than that, they may be losing muscle mass along with fat, which is counterproductive. If they are not losing at all after two to three weeks of consistent diet and exercise changes, the caloric target needs to be adjusted - talk to your vet.

Reassess the Body Condition Score monthly. As your dog loses weight, run the rib test and visual checks regularly. You should start to see a waist emerging from above and a tuck developing from the side. These physical changes are often more meaningful indicators of progress than the number on the scale, since dogs who are exercising will build some muscle while losing fat.

Adjust as you go. As your dog loses weight, their caloric needs decrease. A dog who needed 800 calories per day at 70 pounds may only need 700 calories at 60 pounds. Recalculate with your vet every 5–10 pounds of weight loss to avoid plateaus.

Breed-Specific Considerations

Not all dogs gain and lose weight the same way. Breed genetics play a real role in how easy or difficult weight management will be.

Labrador Retrievers are among the most obesity-prone breeds in the world. Research has identified a specific gene variant (the POMC mutation) carried by a majority of Labs that increases hunger drive and reduces the feeling of fullness after eating. If you have a Lab, expect that dietary discipline will need to be stricter and more consistent than with other breeds.

Brachycephalic breeds like Pugs, French Bulldogs, and English Bulldogs are prone to weight gain and face additional risks during exercise due to their compromised airways. Exercise sessions for these breeds should be shorter, lower intensity, and monitored carefully for signs of respiratory distress. Heat management is critical since these dogs overheat easily.

Small breeds like Dachshunds, Beagles, and Cocker Spaniels are frequently overweight and face outsized health consequences from even modest weight gain. An extra two pounds on a 15-pound Dachshund is equivalent to roughly 25 extra pounds on a human. Small dogs need carefully measured portions and cannot tolerate the caloric margin of error that larger breeds can.

Senior dogs of any breed lose muscle mass naturally as they age, which slows their metabolism. Weight loss in senior dogs should be even more gradual, with a strong emphasis on preserving lean muscle through low-impact exercise. Your vet may recommend a senior-specific diet with higher protein content to support muscle maintenance during weight loss.

Common Mistakes That Stall Weight Loss

Not counting treat calories. This is the number one reason dog weight loss plans fail. Every treat, dental chew, and training reward counts toward the daily total. If the family is sneaking treats throughout the day, the caloric deficit from measured meals disappears.

Relying only on walks. Owners who walk their dog 20 minutes a day and expect weight loss are usually disappointed. Walking at a human pace is not aerobic exercise for most dogs. You need to add real exercise on top of regular walks.

Feeding multiple dogs from a shared bowl. If you have multiple dogs, the overweight dog may be eating more than their share. Feed dogs separately with measured portions and pick up bowls after 15 minutes.

Giving up too early. Healthy weight loss is slow. A dog who needs to lose 15 pounds will take three to four months at a safe rate. Many owners expect faster results and give up after a few weeks when they do not see dramatic changes. Stay the course.

Not involving the vet. Weight loss should always be supervised by a veterinarian. Sudden weight loss, refusal to eat, lethargy, or any other unusual symptoms during a weight loss program warrant an immediate vet visit. Some medical conditions like hypothyroidism and Cushing's disease cause weight gain and need to be ruled out before starting a diet and exercise plan.

When to See Your Vet

Before starting any weight loss program, schedule a vet visit. Your vet will confirm your dog's current weight and BCS, set a realistic target weight, calculate appropriate caloric intake, rule out medical causes of weight gain like hypothyroidism, and identify any exercise restrictions due to joint disease or other conditions.

Follow up every four to six weeks during active weight loss. Once your dog reaches their target weight, continue monitoring with quarterly weigh-ins to catch any regain early.

Putting It All Together

Dog weight loss is simple in theory but requires discipline in practice. The formula is straightforward: get a vet-approved caloric target, measure every meal, cut unnecessary treats, and add consistent structured exercise that actually elevates your dog's heart rate.

The dogs who lose weight successfully are the ones whose owners commit to the process for months, not days. Track the numbers, adjust as you go, and remember that a healthy weight is one of the most impactful things you can give your dog. Research consistently shows that lean, active dogs live significantly longer and healthier lives than their overweight counterparts.

If you are in Hamilton County and looking for structured, low-impact aerobic exercise for your dog, The Canine Gym brings professional slatmill sessions directly to your driveway. Every session tracks distance, speed, calories burned, and more, so you can see your dog's fitness improving over time. We serve Carmel, Fishers, Westfield, Noblesville, Zionsville, and Geist. Book a session and start your dog's weight loss journey the right way.