- A dog is considered overweight when 5 to 10% above its ideal weight, and obese beyond 15 to 20%.
- The Body Condition Score (BCS), assessed by feeling the ribs and observing the waist from the side and above, is the gold-standard tool for judging body condition, far more reliable than the number on a scale.
- The main causes are an imbalance between energy intake and expenditure, neutering (which reduces caloric needs), unaccounted-for dietary extras, and insufficient physical activity.
- Being overweight increases the risk of osteoarthritis, diabetes, and cardio-respiratory issues, and reduces a dog's life expectancy.
- Healthy weight loss should not exceed 1 to 2% of body weight per week and should be managed with veterinary guidance, precise weighing of rations, and progressive physical activity.
A dog gaining weight year after year often happens without us really noticing: a few extra kibbles, slightly fewer walks in the winter, a treat given out of habit. Yet, being overweight is one of the most common health issues observed in veterinary clinics, and one of the easiest to prevent once you know what to look for. Here is how to assess your dog’s body condition, understand why the extra pounds accumulate, and most importantly, how to help them regain a healthy shape without causing frustration.
How do I know if my dog is overweight?
The weight shown on a scale does not tell the whole story: a muscular dog can weigh a lot without being overweight, while a fine-boned dog can be too fat with a seemingly normal weight. This is why veterinarians use a more reliable tool: the Body Condition Score.
The Body Condition Score (BCS), the gold-standard tool
The BCS is a scale, most often graded from 1 to 5 or 1 to 9 depending on the practitioner, which allows for the assessment of a dog’s actual body condition regardless of its breed or size. On the 5-point scale:
A dog scored below 3 is too thin. A score of 3 corresponds to an ideal body condition. Above 3, the dog is overweight, with clear obesity generally noted once they are 15 to 20% over their ideal weight. For example, a 3 kg excess in a 10 kg dog represents a 30% overload, the proportional equivalent of about twenty extra kilos for an adult human.
Simple checks you can do at home
Two checks are enough to get an initial idea at home. Viewed from the side, the belly line should clearly tuck up between the chest and the hindquarters: this is known as the abdominal tuck. Viewed from above, a waist should be visible between the ribs and the hips, somewhat like an hourglass. Next, by running your hands flat over the flanks, the ribs should be palpable under a thin layer of fat without special effort, but they should not be visible to the naked eye in a short-haired dog. If you have to press firmly to feel them, or if the waist and abdominal tuck have disappeared, your dog is likely overweight. When in doubt, a veterinarian is best placed to provide a precise and objective assessment during a simple check-up.
Why is my dog gaining weight?
An imbalance between intake and expenditure
Canine obesity is not a personality trait or a lack of willpower on the dog's part: most of the time, it is a persistent imbalance between calories consumed and calories burned. This imbalance sets in gradually, often over several months, making it difficult to spot on a daily basis.
Neutering, a metabolic turning point
Neutering alters a dog's metabolism and can significantly reduce its daily energy requirements. Yet, many owners continue to feed the same ration as before the operation, which mechanically creates a caloric surplus. The right approach is to be proactive: adjust the amount of food, or switch to a formula adapted for neutered dogs, in the weeks following the procedure rather than waiting to see weight gain.
The extras that add up
A piece of cheese, a bit of bread, table scraps slipped under the table: these are calories, even when they seem trivial. Added up over a week, these little extras can represent a significant portion of a small or medium-sized dog's daily caloric needs, not even counting the treats given during training or play.
Breeds and age: predisposing factors
Certain breeds, notably the Labrador, Beagle, Basset Hound, or Pug, show a more marked predisposition to weight gain, partly for genetic reasons related to appetite regulation. Age also plays a role: a senior dog naturally spends less energy, and its metabolism slows down, which requires adjusting the ration accordingly if physical activity decreases.
What are the health risks?
Being overweight is never a purely aesthetic problem. It significantly increases the risk of developing osteoarthritis and other joint disorders, as the joints must support additional weight daily. It also promotes diabetes mellitus, cardio-respiratory issues, poorer skin and coat quality, and complicates recovery after anesthesia or surgery. Overall, several veterinary studies converge on a similar finding: overweight dogs have a reduced life expectancy compared to dogs of an ideal weight, with a diminished quality of life (shortness of breath, less desire to play, accelerated aging of joints).
How to help your dog reach a healthy weight
Step 1: Consult the veterinarian first
Before changing anything, a visit to the veterinarian allows you to rule out an underlying medical cause (such as a thyroid disorder), define a realistic target weight, and obtain, if necessary, a therapeutic diet adapted for weight loss. These specific formulas are designed to reduce calories while maintaining essential protein and nutrient intake, which a simple reduction of the usual ration cannot guarantee.
Step 2: Weigh rations precisely
Using a kitchen scale rather than a measuring cup or an "eyeballed" estimate changes everything: it is often the simplest and most effective way to regain control over caloric intake. Splitting the daily ration into several small meals, four per day for example, also helps to limit cravings and stabilize appetite.
Step 3: Manage treats intelligently
Rather than eliminating treats entirely, which is rarely sustainable, it is better to deduct them from the total daily ration instead of adding them on top. Pieces of raw vegetables (carrots, zucchini) or treats specifically formulated for weight control can replace part of the more caloric traditional treats.
Step 4: Increase physical activity gradually
Physical activity must be reintroduced gently, especially in a significantly overweight or senior dog, so as not to overstress already weakened joints. It is better to prioritize more frequent, shorter outings than one intense occasional session. Toys that stimulate movement and active play are great allies for burning energy without overexertion, in addition to standard walks.
Toys that slow down food intake and engage the sense of smell are also very useful during a weight-loss phase: they prolong mealtime, provide mental stimulation that partially replaces boredom, and prevent the dog from wolfing down their ration in seconds.
Step 5: Monitor progress over time
Healthy and lasting weight loss should never exceed 1 to 2% of body weight per week: going faster weakens the body and makes weight regain more likely later on. Weighing your dog once a month, at the same time and on the same scale, allows you to track progress without relying solely on visual feel. In case of prolonged stagnation despite a strictly followed ration, a new veterinary check-up allows you to adjust the program rather than becoming discouraged.
Special cases
Overweight senior dog
In an older dog, weight loss must be even more gradual and supervised, because muscle loss that is too rapid can worsen the loss of mobility. The veterinarian will then adapt the program, taking into account any associated conditions, such as osteoarthritis or early-stage kidney failure.
Neutered dog
As mentioned above, the period following neutering is the ideal time to reduce the ration, generally by 20 to 30% according to veterinary recommendations, rather than waiting for the weight to pile on before reacting.
Small breed dog
For small breeds, a few hundred extra grams represent a much larger proportional excess than in a large dog. Regular and precise weighing is therefore particularly important for these breeds, where caloric gaps easily go unnoticed.
Frequently asked questions
How long does it take for a dog to lose weight sustainably?
This depends on the weight to be lost, but with a healthy rate of 1 to 2% per week, a complete program generally spans several months. Patience and consistency matter more than speed.
Can I simply reduce the amount of their usual kibble?
Reducing a standard diet without adapting it can create essential nutrient deficiencies. It is preferable to switch to a formula specifically designed for weight loss, on the advice of your veterinarian.
My dog is constantly begging for food during the diet; is this normal?
This is common, especially at the beginning of the program. Splitting the ration into several small meals and using toys that slow down food intake helps limit this feeling of hunger between meals.
Can being overweight have a medical cause rather than a dietary one?
Yes, some hormonal disorders, such as hypothyroidism, can promote weight gain. This is an additional reason to consult a veterinarian before starting a weight-loss program on your own.
At what age should I start monitoring my dog's weight?
From adulthood, regular weighing, about once a month, helps detect gradual weight gain before it becomes a real weight issue, regardless of the dog's age.
Being overweight in dogs often builds up slowly, but it can be corrected just as gradually, with consistency rather than frustration. To complement a well-measured ration and more stimulating meals, explore our full selection of dog food and feeding accessories.