Puppy Weight Estimates

Mychelle Blake
Veterinarian measuring dog

Whether you've brought home a new purebred puppy or a mixed breed from a shelter, estimating the weight of a puppy when full grown can help you plan for the future. Tracking a puppy's weight and knowing where they should be week to week is also an excellent way of making sure they are thriving. If the puppy's weight is tracking below where they should be, this can alert you to bring them to a veterinarian to check for health problems affecting their growth.

Using a Puppy Weight Chart

A puppy weight table is a general guide to where your puppy's weight should be during the first few weeks and months of their life. You can use the weight chart as a puppy weight calculator by age for predicting a puppy's weight as they grow into an adult. If you have a mixed breed dog, estimating their final weight will be harder. You can use simple calculation by taking the puppy's weight at four months, doubling it and adding ten pounds to get an approximate idea of their final adult weight.

Puppy Weight Chart Template for Toy Dogs

The chart below gives general information for toy size breeds. Typical toy breeds are Chihuahuas, Maltese, and Toy Poodles.

# of Weeks Approximate Weight
8 13-39 oz
12 1-3 lbs
16 1-4 lbs
18 1.5-5 lbs
22 2-5 lbs
26 2-5 lbs
18 months 2.5 to 7 lbs

Puppy Weight Chart Template for Small Dogs

The chart below gives general information for small size breeds. This includes dogs like Boston Terriers, Dachshunds, and Shetland Sheepdogs.

# of Weeks Approximate Weight
8 5-7 lbs
12 6-9 lbs
16 9-12 lbs
18 12-15 lbs
22 13-16 lbs
26 16-18 lbs
18 months 17-23 lbs

Puppy Weight Chart Template for Medium-Size Dogs

The chart below gives general information for breeds that are medium in size. Examples of medium-size breeds include Border Collies, Corgis, and English Springer Spaniels.

# of Weeks Approximate Weight
8 5-9 lbs
12 9-15 lbs
16 13-21 lbs
18 15-25 lbs
22 18-30 lbs
26 21-35 lbs
18 months 27-46 lbs

Puppy Weight Chart Template for Large Dogs

The chart below gives general information for large dog breeds. Some common large dogs are American Pit Bull Terriers, Boxers, and German Shepherds.

# of Weeks Approximate Weight
8 17-19 lbs
12 25-29 lbs
16 35-40 lbs
18 42-48 lbs
22 49-55 lbs
26 59-67 lbs
18 months 70-91 lbs

Puppy Weight Chart Template for Giant Breed Dogs

Giant dog breeds take the longest to grow to their full adult weight. Examples of giant dog breeds are Great Danes, Irish Wolfhounds, and St. Bernards.

# of Weeks Approximate Weight
8 20-26 lbs
12 31-40 lbs
16 45-59 lbs
18 50-65 lbs
22 57-74 lbs
26 70-91 lbs
18 months 91-119 lbs

Age to Reach Final Adult Dog Weight

Toy and small breeds reach their adult weight much faster than larger dogs. A toy or small dog can be fully grown at one year old whereas a giant breed can take up to three years.

Breed Size

Age to Reach Final Weight

Toy

12 months

Small

18 months

Medium

18 to 24 months

Large

2 years

Giant

2 to 3 years

How to Calculate Puppy Height

Calculating the height of your puppy is slightly more complicated than their adult weight. This is because many breeds will achieve their final adult height well before they've reached their final adult weight. For example, a puppy at 16 weeks can be about two-thirds of their adult height but only one-third of their final weight. This is why adolescent puppies regardless of breed can be tall and lanky until they "fill out" around the time they reach adulthood which can be from one to two years depending on breed.

Estimating Puppy Height by Breed Size

While this is somewhat harder to do with a mixed breed, unless you have an idea of what breeds are in the mix, you can get a general idea of your puppy's final height based on their breed size grouping.

  • Toy and small breed dogs usually are their final adult height within ten to 12 months of age.
  • Medium size dogs such as Border Collies and spaniels will reach their final height around 15 months old. In general they will reach 75% of their height at about six months of age.
  • Large size dogs such as German Shepherd and American Pit Bull Terriers should achieve their final adult height around 18 months of age and 75% of the total around six to seven months of age.
  • Giant size dogs such as Great Danes and St. Bernards will reach their final height around 18 months of age.
Golden retriever puppy sleeping in little basket

How Fast Does a Puppy Grow?

How quickly a puppy grows is based on their breed size as well as the stage of development the puppy is in. While the amount varies somewhat by breed, a puppy in general will double their weight after their first week and then gain between five and 10% of their weight each day during their size group's growth spurt period.

  • A toy dog will have its biggest growth spurt between birth and 11 weeks of age.
  • Small to medium size breeds have the largest growth rate between birth and 16 weeks of age.
  • A large or giant breed dog can be expected to have its largest growth rate between birth and five months of age.

Factors Affecting a Puppy's Growth

These percentages and milestones are a guide for the "average" puppy. There are additional factors that can come into play that can affect a puppy's normal growth or their growth rate compared to the "average" dog.

Genetics

Breed issues aside, genetics still play a large role in puppy weight. While the standard rule is to examine the same sex parent for an idea of the puppy's eventual size, there are exceptions. Some puppies may inherit a "big girl" gene or a "tiny boy" gene from a parent. These genetic variables will result in a larger female dog and a smaller male dog.

Nutrition

Early nutrition can play a huge role in puppy weight despite the breed or genetic influences. Lack of sufficient nutrition in the early weeks of a puppy's life can seriously impact its growth and health, including its weight. Poor maternal milk or early weaning can also stunt a puppy's growth.

Sterilization

Spaying or neutering a puppy can affect their growth rate to a limited degree. This difference may be more pronounced for early spay/neuter which is common in shelters which can make determining the adult height and weight of an unknown mixed breed slightly harder.

Sex

The numbers provided in puppy weight charts are often based on either an average of male and female average weights, or on the average male dog weight alone. In many breeds, females can be noticeably smaller than males and this should be taken into account when estimating a female dog's future height and weight.

Mixed Breeds

If a mixed breed's parentage is known, you can take an average for the estimated heights and weights for each parent's breed and use that to get an idea of the future adult weight. Realize though that genetics can create wide variations in dogs and when the two breeds vary widely in height and weight, a puppy can tend to favor the larger parent or the smaller one, or fall somewhere in the middle. If a puppy's parentage is unknown, DNA testing is available that can help you to pinpoint with some degree of accuracy your dog's heritage in order to estimate their future height and weight.

Three puppies posing with an antique scale

How Big Will My Puppy Get?

Everyone who brings home a new puppy, whether purebred or mixed, inevitably wants to know how large their new friend will be once they're fully grown. Following a puppy weight chart and understanding the typical growth patterns of a puppy can help you to estimate your dog's future height and weight. It's not an exact science but you can usually estimate within a few pounds and inches just how big he or she will be when puppyhood is finally over.

Puppy Weight Estimates