Whoever said that weeds grow quickly didn’t know puppies. These furry dynamos seem to grow up right before your eyes. One minute you’re cuddling a cute, little pup and the next your best friend has tripled in size.

How big will my puppy get?

How big your puppy will get depends on a few factors. These include your pup’s breed and gender. Many dogs more than double their weight from 14 weeks to 12 months, but that varies.


Your dog’s breed has a great deal to do with how big they get. Small pups finish growing more quickly than large breeds, according to the American Kennel Club. Here are the eventual weights of the five main categories of pups by size.


Weight Range

Typical Age That Growth Peaks


Up to 12 pounds

Between 8 and 9 months


12-25 pounds

Between 8 and 12 months


25-50 pounds

Between 9 and 12 months


50-100 pounds

Between 12 and 18 months


100 pounds+

Between 12 and 18 months

Nutrition, guidance, care-

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Find a PUPPO nutrition plan that takes care of your pups body and brain, at all stages of life.


Just like people, male dogs tend to be larger than female pups.


If you neuter or spay pups before they finish growing, they can end up weighing a bit more and being taller than dogs that didn’t have a procedure early. This may occur because surgery can alter brain chemistry, causing an override in the dog’s system, which would otherwise signal to the pup to stop growing.


If you’ve seen your pup’s parents, their size can give you a good idea of how big your pup will get.

Puppy Growth Chart

If you want to find out at a glance how quickly your puppy will grow, check out this growth chart below. You can also use a puppy weight calculator to determine eventual size. Enter vital information into the calculator, such as breed, birth date, and weight when born. The calculator will let you know how much your puppy will weigh at maturity.

puppt growth chart
Image via Canine Journal

Typical adult dog weights by breed size

As we mentioned above, a dog’s growth rate varies by breed. Here is more information on what to expect, depending on your pup’s breed size.

Toy Breeds

Toy breeds like Chihuahua, Shih Tzu, Pekinese, Pomeranian, Toy Poodle and Yorkshire terrier grow the fastest, stopping between 8 and 9 months. They generally gain 5 to 10 percent of their body weight a day.

To predict your toy breed pup’s mature weight, take their weight at six weeks and then double it and double it again. For instance, two pounds x two pounds equals 4; then 4 pounds x 2 pounds equals eight, which is the approximate weight.

Small Breeds

Small breeds like Beagle, Jack Russell Terrier, Shetland Sheepdog, and Pug usually stop growing between 8 to 12 months. Most of their growth occurs until they’re 11 weeks old. They generally gain 5 to 8 ounces a week. To determine their mature weight, take the weight at six weeks and double it and double it again.

Medium Breeds

Medium-sized breeds like Cocker Spaniel, Whippet, and Bulldog often reach their mature weight between 9 to 12 months. They grow the most quickly until 6 weeks. To see how much your medium breed dog will weight at maturity, take their weight at 14 weeks, multiply that by 2, then add your answer to half of their 14-week weight.

Large Breeds

Large breeds like Boxer, Golden Retriever, and Labrador Retriever will reach maturity anywhere from 12 to 18 months. Most of the growth occurs in up to 20 weeks. Calculating their adult weight is easy. Just double their weight at 6 months old.

Giant Breeds

Giant breeds such as Great Dane, Mastiff, and Saint Bernard usually take from 12 to 18 months to complete growth. Usually, the quickest growth occurs up to 25 weeks old. Calculate giant breed mature weight like you do large breeds. Double their 6-month-old weight.

How long is my dog considered a puppy?

No matter what, they’ll always be your puppy! But in all seriousness, it depends on breed and size, which we’ve talked about extensively in this post. The larger the breed of your dog is, the longer it will take them to grow, and therefore, the longer they are a puppy. 

There are, however, a couple of telltale signs that your pup is all grown up, including:

  • They’ve lost all their baby teeth
  • They begin to calm down and destructive behaviors (think, chewing up all your shoes) will become less frequent
  • Their coat will become more coarse
  • They stop growing

How much, and what, do I feed my growing puppy?

How much you feed your growing pup will depend on a variety of factors, like breed and size. It’s also important to ensure that you’re feeding your fur friend the correct blend of food for their growing body. There are a lot of considerations, as well as options. Puppo’s Puppy Nutrition Plan is designed with the nutritional needs of your pup in mind, providing simple and clear recommendations that your dog will love. The plan also evolves and grows alongside your dog, with monthly check-ins to ensure portion sizes are still appropriate for their current needs.

Puppo meets the needs of a variety of pups at different stages