Puppy Growth Chart by Breed

The puppy growth milestones from birth to adulthood compress 15 human-equivalent years of physical, neurological, and behavioural development into 8 to 24 months depending on breed size.

A puppy's first year is not just about getting bigger. Skeletal growth, dental eruption, neurological maturation, hormonal changes, growth plate closure, and behavioural development all follow overlapping but distinct timelines. Weight gain is the most visible indicator, but it is one dimension of a far more complex developmental programme. Knowing what is happening inside your puppy — not just what the scales say — helps you make better decisions about feeding, exercise, socialisation, and veterinary care at each stage.

Predict your puppy's adult size with the puppy growth prediction tool, which uses breed-specific WALTHAM growth curves to estimate final weight based on current age and weight. The milestones below provide the developmental context that makes those weight numbers meaningful.

Size Categories and Why They Matter

Domestic dogs show the widest range of adult body sizes of any mammalian species. A 1.5 kg Chihuahua and an 80 kg English Mastiff are the same species with the same genome but radically different growth trajectories. Veterinary science divides these trajectories into four size categories, each with distinct developmental timelines.

The paradox of canine growth is that larger breeds take longer to mature but age faster once they do. A Great Dane puppy that does not reach adult size until 20 months may enter its senior years by age 5. A Yorkshire Terrier that is fully grown at 9 months may not reach senior status until age 12. The science behind canine ageing models explains why this trade-off exists at the cellular level.

Birth to 2 Weeks — Neonatal Period

Puppies are born functionally blind and deaf, with sealed ear canals and eyelids. Movement is limited to crawling. Body temperature regulation is absent — neonates rely entirely on the dam and littermates for warmth, which is why a whelping box temperature of 29 to 32°C is critical in the first week. Birth weight varies enormously by breed: a Chihuahua puppy may weigh 90 to 140 g, while a Great Dane puppy typically weighs 500 to 700 g.

During this period, healthy puppies should gain 5 to 10% of their birth weight daily. Failure to gain weight in the first 48 hours is a veterinary concern. The umbilical cord dries and detaches within 2 to 3 days. Suckling reflexes are fully functional from birth, but coordinated movement and purposeful behaviour are absent.

2 to 4 Weeks — Transitional Period

Eyes open between days 10 and 14, though vision remains blurry for another week. Ear canals open around day 14 to 17, introducing auditory stimuli. The first deciduous teeth (incisors) begin erupting at approximately 3 weeks. Puppies begin attempting to stand and walk between weeks 2 and 3, though coordination is poor and falls are frequent.

This period marks the transition from purely reflexive behaviour to the beginnings of voluntary interaction with the environment. Puppies start responding to sounds, light, and movement. Elimination shifts from entirely dam-stimulated to partially voluntary. The neurological development during these two weeks is extraordinary — equivalent to several years of human infant development compressed into 14 days.

4 to 8 Weeks — Socialisation Begins

The period from 4 to 8 weeks is one of the most behaviourally significant in a dog's entire life. Puppies become mobile, playful, and interactive. Play-fighting with littermates teaches bite inhibition — the ability to control jaw pressure. Puppies removed from their litter before 7 to 8 weeks often struggle with bite inhibition as adults, which is one reason responsible breeders do not release puppies before 8 weeks of age.

Weaning typically begins at 3 to 4 weeks as the dam's milk production starts declining relative to the litter's growing demands. By 6 to 7 weeks, most puppies are eating softened solid food regularly. The transition from milk to solid food should be gradual — abrupt weaning causes gastrointestinal distress and nutritional gaps. A puppy feeding portion calculator helps establish appropriate calorie targets for newly weaned puppies based on current weight and size category.

Deciduous canine teeth erupt at 4 to 5 weeks, followed by premolars at 5 to 6 weeks. By 8 weeks, most puppies have a complete set of 28 deciduous teeth. Weight at 8 weeks varies dramatically: a Toy Poodle puppy may weigh 0.8 to 1.2 kg, while a Bernese Mountain Dog puppy typically weighs 5 to 8 kg.

8 to 12 Weeks — Critical Learning Window

Puppies arrive in their new homes during this period, typically at 8 weeks. The window from 8 to 12 weeks is the peak socialisation period — experiences during these four weeks disproportionately shape a dog's lifelong temperament and confidence. Positive exposure to varied people, surfaces, sounds, other animals, and environments during this window reduces the likelihood of fear-based behaviour in adulthood.

The first vaccinations typically occur at 6 to 8 weeks, with boosters at 10 to 12 weeks and 14 to 16 weeks. Use a vaccination schedule planner to generate a personalised timeline for your puppy's core and lifestyle vaccines. Socialisation must be balanced against infection risk — puppies can socialise in controlled environments (puppy classes with vaccinated dogs, private gardens, friends' vaccinated dogs) before completing their vaccination course, but should avoid public areas with unknown dogs until fully vaccinated.

Growth rate during this period is rapid across all size categories. Small breed puppies may gain 30 to 50 g per day. Large breed puppies can gain 100 to 200 g per day. This is the beginning of the most intense growth phase, and nutritional adequacy is critical. Puppies under 12 weeks typically require 3 to 4 meals per day to meet energy demands without overloading their small stomachs.

3 to 6 Months — Rapid Growth Phase

This is the period of fastest absolute growth for most size categories. Toy and small breed puppies may reach 50 to 60% of their adult weight by 4 months. Large and giant breed puppies are growing at their highest daily rate but are still proportionally further from their adult weight — a Great Dane at 4 months may be only 30% of its final weight despite gaining over 200 g per day.

Deciduous teeth begin falling out at 12 to 16 weeks, replaced by permanent adult teeth. The incisors fall first, followed by the canines and premolars. This process can be uncomfortable — increased chewing behaviour is normal and should be directed toward appropriate toys rather than suppressed. Some puppies experience mild fever, reduced appetite, or drooling during teething. Bloody spots on chew toys where deciduous teeth have loosened are normal.

The "gangly" phase begins during this period, particularly in large and giant breeds. Legs may appear disproportionately long relative to the body as skeletal growth outpaces muscle development. Paws that seem comically oversized at 4 months are growing to accommodate the eventual adult skeleton — though paw size is an unreliable predictor of final adult weight, contrary to popular belief.

Exercise during this period requires careful calibration. Open growth plates are vulnerable to repetitive impact injuries. The common guideline of 5 minutes of structured exercise per month of age (twice daily) provides a reasonable starting framework, though individual breed and temperament adjustments are necessary. Use an age-appropriate exercise calculator to check safe limits for your puppy's breed and current age. Free play on soft surfaces, controlled swimming, and short training sessions are preferable to long walks on hard pavement or repetitive fetch on concrete.

6 to 12 Months — Adolescence and Sexual Maturity

Sexual maturity arrives at different ages by size category. Toy and small breeds may reach sexual maturity as early as 5 to 6 months. Medium breeds typically at 6 to 9 months. Large breeds at 9 to 12 months. Giant breeds may not reach sexual maturity until 12 to 18 months. The onset of sexual maturity does not mean physical maturity is complete — a 6-month-old intact male small breed is sexually capable but still has months of skeletal growth ahead.

Behavioural changes during adolescence can be dramatic. Increased independence, selective deafness to previously learned commands, resource guarding, and territorial marking may emerge. Fear periods — temporary phases where a previously confident puppy becomes wary of novel stimuli — can recur between 6 and 14 months. These are neurological, not behavioural failings, and require patient, positive-reinforcement management rather than punishment.

Adult teeth should be fully erupted by 6 to 7 months, giving a complete set of 42 permanent teeth. Any retained deciduous teeth at this point should be evaluated by a veterinarian — retained deciduous teeth can cause misalignment, crowding, and predispose to early dental disease. The complete adult dentition is one of the clearest markers that a puppy has transitioned from the juvenile to the adolescent phase.

Toy and small breed puppies approach their adult weight during this period. Many small breed owners transition from puppy food to adult maintenance diets between 9 and 12 months. Large and giant breed puppies remain in their intensive growth phase and should continue on breed-appropriate puppy or large-breed junior food until their veterinarian recommends transitioning.

12 to 24 Months — Maturation and Body Filling

For toy and small breeds, this period represents early adulthood. Most have reached full skeletal height by 12 months and are filling out muscle mass. Medium breeds complete skeletal growth between 12 and 15 months and spend the remaining time developing muscle definition and body condition.

Large breeds continue skeletal growth until 15 to 18 months. Growth plates in the long bones (femur, tibia, humerus, radius) close progressively, with the last plates typically closing at 14 to 16 months. Once growth plates have closed, exercise restrictions related to impact protection can be relaxed — though joint health remains important throughout life.

Giant breeds may continue growing until 20 to 24 months. A 12-month-old Great Dane that weighs 45 kg may reach a final weight of 55 to 70 kg over the next 8 to 12 months. This extended growth period means giant breed puppies require specialised nutrition for longer — specifically controlled calcium and phosphorus ratios to prevent developmental orthopaedic diseases like osteochondrosis and hypertrophic osteodystrophy.

The canine age conversion tool reveals that a 1-year-old dog of any size is biologically equivalent to approximately a 15-year-old human — physically mature in many respects but not yet psychologically settled. Behavioural maturation, particularly impulse control and emotional stability, continues well past the point where physical growth is complete. Most dogs do not reach full behavioural maturity until 2 to 3 years of age, with giant breeds at the later end of that range.

Growth Disruptions — When to Worry

Not all puppies follow textbook growth curves. Deviations from expected weight gain can signal nutritional problems, intestinal parasites, congenital conditions, or endocrine disorders. The following patterns warrant veterinary assessment.

Sustained weight plateau lasting more than 2 weeks during the rapid growth phase (3 to 8 months) is abnormal. Some fluctuation is expected, but a puppy that stops gaining entirely needs investigation. Common causes include heavy intestinal worm burdens (roundworms and hookworms are endemic in puppies), inadequate calorie intake, and gastrointestinal malabsorption.

Disproportionate limb development — one leg appearing shorter or bowed compared to the others — can indicate premature growth plate closure in a single limb, typically from trauma. This condition requires orthopaedic assessment because asymmetric growth can worsen rapidly as the puppy continues growing.

Excessive growth rate in large and giant breeds carries its own risks. Puppies growing faster than breed-standard curves (consistently above the 90th percentile) may benefit from calorie restriction to slow the growth rate without reducing final adult size. Rapid skeletal growth without proportionate supportive tissue development increases the risk of developmental orthopaedic diseases. Using weight management guidance in conjunction with growth tracking helps ensure the growth rate stays within healthy bounds.

Tracking Growth — Practical Advice

Weigh your puppy weekly during the first 6 months, then fortnightly until growth is complete. Use the same scale each time — bathroom scales work for small puppies (weigh yourself, then weigh yourself holding the puppy, and subtract). For larger puppies, many veterinary practices offer free weigh-ins on their floor scales.

Record weights consistently and plot them against breed-specific growth curves. The puppy growth prediction tool generates a visual growth curve based on WALTHAM breed data, showing where your puppy sits relative to the expected trajectory. A puppy tracking along the 40th percentile curve is not "behind" — it is likely an individual on the smaller side of the breed standard, and attempting to push it to the 60th percentile through overfeeding creates more problems than it solves.

Feeding frequency should decrease as the puppy grows. From weaning to 12 weeks: 3 to 4 meals per day. From 12 weeks to 6 months: 3 meals per day. From 6 months to adulthood: 2 meals per day. The total daily calorie amount increases with weight, but distributing it across fewer meals reflects the puppy's increasing stomach capacity and more stable blood sugar regulation.

Sources

Growth plate closure timelines reference Sumner-Smith (1966) and subsequent veterinary orthopaedic texts. Deciduous tooth eruption and replacement schedules follow Wiggs and Lobprise, "Veterinary Dentistry: Principles and Practice." WALTHAM growth curve data is from the WALTHAM Petcare Science Institute published breed-specific growth charts. Socialisation window and fear period timing references Scott and Fuller, "Genetics and the Social Behavior of the Dog," and Serpell, "The Domestic Dog." Exercise guidelines for growing puppies follow BSAVA and British Veterinary Association recommendations. Size-category age classification follows AAHA Canine Life Stage Guidelines (2019).