Puppy Weight Monitoring: Tracking Healthy Weight Gain

How to Weigh Your Puppy at Home?

For small and medium puppies, the easiest home weighing method is to stand on bathroom scales holding your puppy, then weigh yourself alone and subtract. For very small puppies, use a kitchen scale with a flat pan or basket. For larger puppies that outgrow the carry method, most veterinary practices allow you to use their walk-on scales at no charge; simply call ahead.

Weigh your puppy at the same time of day each week for consistency, ideally before their morning meal. Record each weight in a notebook, spreadsheet, or puppy health app. A graph of weekly weights provides a visual growth curve that makes it easy to spot deviations from the expected trajectory. Many UK vets offer puppy growth tracking as part of their health plan services.

Your vet will weigh your puppy at every visit and plot their growth against breed-specific growth curves. These curves show the expected weight range for your breed at each age. A puppy consistently tracking along the middle of the curve is growing as expected. A puppy crossing percentile lines (moving from the 50th to the 25th percentile, for example) may need dietary adjustment or health investigation. See our growth chart guide for breed-specific expectations.

What Is the Expected Growth Rates by Breed Size?

Small breeds (adult weight under 10 kg) grow fastest relative to their size but reach adult weight soonest. They typically reach 50 percent of adult weight by 3 to 4 months and full adult weight by 9 to 12 months. A Miniature Dachshund puppy might weigh 1 kg at 8 weeks and reach 5 kg by 12 months. Growth is rapid in the first 3 months then gradually slows.

Medium breeds (10 to 25 kg adult weight) reach 50 percent of adult weight by 4 to 5 months and full size by 12 to 15 months. A Border Collie puppy might weigh 3 to 4 kg at 8 weeks and reach 15 to 20 kg by 14 months. Growth is most rapid between 3 and 6 months during the peak growth phase.

Large and giant breeds (over 25 kg adult weight) have the longest growth period. They reach 50 percent of adult weight by 5 to 6 months but do not reach full adult weight until 15 to 24 months. A Labrador puppy might weigh 5 to 7 kg at 8 weeks and reach 25 to 35 kg by 18 months. It is particularly important that large breed puppies grow at a controlled rate to prevent developmental orthopaedic problems.

What Are the Body Condition Scoring for Puppies?

Weight alone does not tell you whether your puppy is the right shape. A 10 kg puppy of one breed may be overweight while a 10 kg puppy of another breed is underweight. Body condition scoring (BCS) assesses your puppy’s shape and fat coverage on a 1 to 9 scale, where 1 is emaciated and 9 is obese. The ideal score for a growing puppy is 4 to 5.

To score your puppy at home, run your hands along their ribcage. You should be able to feel each rib easily without pressing hard, with a thin layer of covering. If you cannot feel the ribs at all, the puppy may be overweight. If the ribs are prominent with no covering, the puppy may be underweight. Viewed from above, a healthy puppy should have a visible waist behind the ribs. Viewed from the side, the belly should tuck up behind the rib cage.

Puppy body condition varies naturally during growth. A puppy going through a growth spurt may look temporarily lean as they gain height before filling out. A puppy between growth spurts may look slightly chubby before their next height increase. These fluctuations are normal. Consistent trends in one direction (getting steadily thinner or steadily fatter) over several weeks warrant attention. Your vet can demonstrate body condition scoring at routine appointments.

What Are the Risks of Under and Overweight Puppies?

Underweight puppies may not be getting enough nutrition for proper growth and development. Common causes include insufficient feeding quantity, poor food quality, intestinal parasites (worms), dental problems making eating painful, competition from siblings, or underlying health conditions. A puppy that fails to gain weight despite adequate food intake needs veterinary investigation to rule out medical causes.

Overweight puppies face serious health risks, particularly in larger breeds. Excess weight during growth increases the risk of developmental orthopaedic diseases including hip dysplasia, elbow dysplasia, and osteochondritis dissecans. Research at the University of Liverpool found that overweight Labrador puppies had significantly higher rates of joint problems than those maintained at ideal weight. Puppy obesity also establishes fat cells that persist into adulthood, making lifelong weight management harder.

The PDSA estimates that over a third of UK dogs are overweight or obese. The foundation for a healthy weight is established in puppyhood. Feed measured portions based on your puppy’s body condition rather than following packet guidelines uncritically. Treat intake should not exceed 10 percent of daily calories. Use portion of the daily food allowance for training treats rather than adding extra food. Our feeding mistakes guide covers portion control in detail.

When to See a Vet About Weight Concerns?

See your vet if your puppy stops gaining weight for more than 2 weeks during the growth period, loses weight at any point, gains weight much faster than breed expectations, has a body condition score below 3 or above 7, shows changes in appetite (suddenly eating more or less), has a visibly pot-bellied appearance (may indicate worms), or looks noticeably different from littermates or same-breed puppies of the same age.

Breed-specific growth charts from your vet provide the most accurate comparison. Online growth calculators can give a general guide but may not account for the wide variation within breeds, particularly mixed breeds. Your vet’s growth charts are based on the specific breed and account for sex differences (males are typically larger than females in most breeds).

If you have a mixed-breed puppy or rescue with unknown parentage, your vet can estimate adult size based on current growth rate, paw size, and physical proportions. DNA testing services available in the UK can identify breed mix, which helps predict adult size and growth patterns. Regular vet check-ups during the growth period (typically at vaccination appointments) provide the best professional monitoring of your puppy’s development. Our first vet visit guide covers what growth checks to expect.