Weight can creep up gradually in dogs, which is why many owners do not notice a change until collars feel tighter, walks become slower or a vet points it out at a routine appointment. Healthy weight management is not about making a dog thin; it is about keeping them at a body condition that supports comfortable movement, good stamina and long-term health.
The PDSA states that being overweight is linked with health problems and a reduced lifespan, and recommends looking at body shape as well as the number on the scales. Their guide to obesity in dogs is a useful reference for owners concerned about weight.
How can you tell if your dog is overweight?
Because breeds vary so much, there is no single “correct” weight that works for every dog. A better starting point is body condition scoring.
The PDSA body condition guide recommends looking and feeling for a visible waist, a tucked abdomen and ribs that can be felt with a light touch without being sharply visible.
1. Measure food rather than guessing
Portion sizes are easy to underestimate. A scoop or cup can vary significantly depending on how full it is, so weighing food on kitchen scales is often more accurate.
Use the feeding guide on the food as a starting point rather than an absolute rule. Activity level, neuter status, age and individual metabolism all affect requirements. If your dog needs to lose weight, your vet can help set an appropriate daily calorie target.
2. Count treats as part of the daily intake
Treats can quietly add a large number of calories. Training treats, chews, table scraps and food given by other family members all count.
One simple strategy is to reserve part of your dog’s measured daily ration for training. You can also use praise, play, toys or a short sniffing game as rewards instead of always using food.
3. Avoid crash diets
Weight loss should be gradual and planned. Cutting food dramatically without veterinary guidance can result in poor nutrition, hunger and loss of muscle.
Dogs with substantial excess weight or health problems benefit from a vet-led plan. A veterinary weight-loss diet may be recommended because it can provide the necessary nutrients while reducing calorie intake.
4. Build exercise around the individual dog
Exercise supports fitness and helps maintain muscle, but the right amount depends on age, breed, current fitness and health.
An overweight dog that has been inactive should not suddenly be taken on long, intense walks. Increase activity gradually. Shorter walks, sniffing, gentle play, swimming where appropriate and regular movement throughout the day can all contribute.
If your dog has stiffness or joint problems, our guide to supporting your dog’s joints and mobility explains how to keep movement manageable.
5. Monitor progress in more than one way
Regular weigh-ins are useful, but body shape, waist definition, stamina and measurements can also show progress. Take photos from above and from the side every few weeks if your vet has advised weight loss. Small changes are easier to see when you compare images over time.
6. Think about why weight increased
Overfeeding and low activity are common causes, but they are not the only ones. Ageing, reduced mobility, neutering and some medical conditions can affect weight.
If your dog gains weight despite an unchanged routine, becomes unusually hungry, drinks more, seems lethargic or develops other symptoms, speak to your vet.
7. Make meals more engaging
Slow feeders, puzzle feeders and food-dispensing toys can make a measured meal last longer and provide mental stimulation. Scatter feeding can also encourage gentle movement and sniffing.
Make sure any food used in enrichment comes from the planned daily allowance rather than being added on top.
8. Support mobility while weight comes down
Extra body weight puts additional load on joints, so dogs that are overweight may tire more quickly or appear stiff. Non-slip flooring, supportive beds and sensible exercise can help while weight is being addressed.
You can browse our Joint & Mobility collection and wider Dog Wellness collection for complementary everyday support.
When should you ask your vet for help?
Speak to your vet if you are unsure what your dog’s ideal weight should be, if they have a lot of weight to lose, if mobility is limited, or if weight changes happen without an obvious reason. Your vet can rule out medical causes and help you build a safe plan.
Frequently asked questions
How quickly should a dog lose weight?
The safest rate depends on the individual dog, so follow a veterinary plan rather than aiming for a rapid result. Gradual progress is generally easier to maintain.
Should I feed for current weight or target weight?
Feeding guidance may need to be based on an appropriate target rather than the current weight when a dog is overweight. Your vet or vet nurse can help calculate this.
Can exercise alone solve weight gain?
Exercise is valuable, but calorie intake matters too. Most successful plans combine measured feeding with suitable activity.
Do I need special “diet” dog food?
Not every dog does. Some can lose weight through carefully controlled portions of their usual complete food, while others benefit from a veterinary weight-management diet.
This article provides general information. Dogs with significant excess weight, illness or mobility problems should have an individual plan agreed with a veterinary professional.