Does The Biggest Puppy Become The Biggest Dog? [5 Easy Methods And 7 Charts]


Whether you are planning to get a new family member, or you just want to estimate your puppy’s future size: ideally, you would have an estimate as early as possible to know how big your dog will become. There are numerous factors that influence your pup’s growth, even among its siblings. We collected information for you to find out know how big your puppy will become.

Does The Biggest Puppy Become The Biggest Dog?

Answered: Does The Biggest Puppy Become The Biggest Dog?

The biggest puppy in the litter will not always become the biggest dog. The final size is predetermined and genetically inherited. The height of the parent dogs will get you a good estimate. If you got a mixed breed and have seen the parents, you still might need to use a chart for dog classification.

Multiple factors exacerbate a proper estimation of how bug your pup will become. Your best bet is two take a look at the dog’s parents. If the parents are not available, look at a size chart for your breed. If you roughly know the breeds, have a look at our charts in this article to get an estimate.

If you don’t know which breeds might be in your dog and you the parents are not available, it gets difficult. What you can do in such a situation is to look at the puppy’s paw size for a rough estimate. The bigger its paw size is in relation to its body, the taller your puppy will grow. Paws grow faster than the rest of the body to support its very growth.

Only a DNA test can give you confidence in finding out what breeds your dog is made of. Based on those results, you can then derive its estimated size.

What Factors Influence Puppy Growth?

The relevant factors are breed, gender, and castration status.

  • Breed. Dog breeds are like a pack of jelly beans. Numerous breeds have different sizes and range anywhere from tiny to gigantic dogs.
  • Gender. Female dogs tend to be biology smaller than male dogs. This applies to their weight and body height.
  • Castration | Neutering. If your puppy has been doctored, its growth rate is weakly influenced, which could result in a slightly smaller body height. The reason for this is hormonal. A change in hormonal balance in their growth phase likely influences the final dog size.

Determine Size & Weight With Rules Of Thumb

If you are to get a purebred dog and you can visit the parents and perhaps even see other relatives and their sizes, you can take those as a reference to see how big your dog will get.

Depending on how old your puppy is, you can apply rules of thumb to derive its final proportions. However, this method will only give you a rough estimate of your puppy’s final proportions. The reasons for this are twofold.

First, there are numerous dog breeds that can be categorized into different size classes. The classes are toy, small, medium, large, and giant. Depending on how tall your puppy’s breed is, it might grow up at different rates.

Second, some dogs just grow slower or faster than others. If you were to check among puppies in a litter, their sizes would differ slightly in regards to body and paw size.

Growing up is a process that might take longer than you would expect. Dogs appear to be mostly grown by the age of nine months, but in fact most dogs grow for almost two years to reach their final weight.

Puppies grow rapidly in the first six to nine months of their life, depending on breed and gender. After that point, the growth spreed decreases and they grow slower until they are considered full-grown at around 100 weeks, or roughly two years.

The following rules of thumb will give you a rough indicator of your puppy’s final size.

  • The dog parents are available during a visit.
    • Mom weighs less than 20 lbs (9 kg): Take your pup’s weight at six weeks and multiply it by 3.
    • Mom weighs more than 30 lbs (13.5 kg): Take your pup’s weight at five months and multiply by 2.
  • The dog parents are not available during a visit.
    • Your puppy is four months old: Your pup is more or less half-grown. Measure its weight and multiply it by two to get a rough estimate how heavy your pup will become one day.
    • Your puppy is six months old: Take your pup’s height. Multiply it by 1.33. This should give you another indication of how big it might become.

Note that rules of thumb may have low accuracy. For higher precision, it is necessary to know what breeds there are in your puppy. Whether you do (not) know the puppy’s parent dogs and/or its breed, using a comparison chart is a more suitable method do get closer to your puppy’s actual future proportions.

Does The Biggest Puppy Become The Biggest Dog?

Dog Breed Classification (Up To 2 Years)

Toy-Sized Dog Breeds

Toy-Sized puppies weigh less than 6.5 kg within 2 years. The full-grown size of those dogs usually reaches up to 12 inches (30.5 cm). Breeds of the toy-sized category are:

  • Pomeranian, Papillon, Toy Poodle, Maltese, Yorkshire Terrier, Chihuahua

Small Dog Breeds

Small-sized dog puppies weigh between 6.5kg and 9kg within 2 years. The full-grown size of those dogs usually reaches up to 18 inches (45.7 cm). Breeds of the small-sized category are:

  • Silky Terrier, Miniature Poodle, Miniature Pinscher, rat Terrier, Peek A Poo, Miniature Dachshund, Havanese, Shih Tzu, Dachshund, Italian Greyhound, Pekingese, Bichon Frise, Miniature Schnauzer, Fox Terrier, Standard Schnauzer, Cavalier King Charles Spaniel, Standard Poodle, West Highland White Terrier, Lhasa Apso, Jack Russell Terrier, Cairn Terrier, Pug

Medium Dog Breeds

Medium-sized dog puppies weigh between 9kg and 15kg within 2 years. The full-grown size of those dogs usually reaches up to 25 inches (63.5 cm). Breeds of the medium-sized category are:

  • Cock A Poo, Scottish Terrier, Boston Terrier, American Eskimo, Beagle, Shiba Inu, Shetland Sheepdog, Welsh Corgi, French Bulldog, American Cocker Spaniel, Samoyed, Soft Coated Wheaten Terrier, Brittany Spaniel, Chow Chow, Shar Pei, Bull Terrier, Basset Hound, English Springer Spaniel, Border Collie, Australian Shepherd, Australian Cattle Dog, Collie

Large Dog Breeds

Large-sized dog puppies weigh between 15kg and 30kg within 2 years. The full-grown size of those dogs usually reaches up to 30 inches (76.2 cm). Breeds of the large-sized category are:

  • Siberian Husky, Hungarian Vizsla, Staffordshire Bull Terrier, English Bulldog, German Pointer, Dalmatian, Pit Bull, Boxer, American Staffordshire Terrier, Weimaraner, Labrador Retriever, Golden Retriever, Doberman Pinscher, German Shepherd, American Bulldog, Rottweiler, Great Pyrenees, Rhodesian Ridgeback, Alaskan Malamute, Akita, Cane Corso

Giant Dog Breeds

Giant-sized dog puppies weigh between 30kg and 40kg within 2 years. The full-grown size of those dogs usually reaches up to 44 inches (111.8 cm). Breeds of the large-sized category are:

  • Mastiff, Saint Bernard, Great Dane

Determine Size & Weight With Dog Breed Charts

Knowing your puppy’s breed will give you a more precise estimate than any rule of thumb. This method is backed up by science.

This chart shows the average weight of young dogs starting from 3 months (12 weeks) up to 2 years. Dogs grow exceptionally fast within the first six to nine months. By looking at the chart, you can get a quick idea of how big your pup will become over the course of the next few months, up to two years.

How To Read a Dog Chart?

First, make sure that to find out what breeds are in your puppy. Ideally, you can narrow it down to one or two dog breeds. Use the dog breed categorization of this article to see what comes close. Note the size class your selected breed belongs to. Then, hover over the data points in the chart to get an estimate of your pup’s future proportions. Below, we have created charts for every dog breed class for you to take a look at the growth rates in detail.

Growth Chart For Toy-Sized Dog Breeds

While toy-sized dogs start off relatively light, they will have a rapid surge in the first year. Among all classes, toy-sized breeds indicate the smallest increase in body weight over the course of two years. They show an estimated 250% increase in weight between three months and two years.

Growth Chart For Small Dog Breeds

Small dogs show a slightly higher percental weight increase over two years. They increase in body weight up to 270%. The highest growth rate happens early on. In the first year, small dogs grow mostly fast, and the weight increase slows down in the second year.

Growth Chart For Medium Dog Breeds

Medium-sized dog breeds double their weight within three months. After this period, weight increase slows down. Within the second year, medium-sized dog breeds only grow slowly. However, over the course of two years, they show a 310% increase of body weight.

Growth Chart For Large Dog Breeds

Large-sized dog breeds gain more than twice their initial weight within the first half year. Yet, their growth rate slows down after six months, and they increase their weight and height slow and steady until they reach the two-year mark. Large dogs show a body weight increase of 340% over the course of two years.

Growth Chart For Giant Dog Breeds

Giant-sized dog breeds indeed show giant steps while growing. They almost triple their weight in the first six months, an impressive indicator of how tall they are about to grow. After the first year though, they are mostly grown and show the smallest increase among all dog classes. They indicate a body weight increase of 400% over the course of two years.

How Much Smaller Are Female Dogs?

Among all dog classes, the difference between female and male dogs is consistent. Averagely, female dogs are 12.5% less heavier than male dogs, which also shows in a smaller body height. While male dogs show the highest increase in weight up to six to nine months, female dog growth slows down earlier, on average between six to eight months.

How To Measure My Dog’s Height?

Find a measuring tape. Measure from paws to withers. The withers are located between your puppy’s shoulders and the lower base of its neck. Write down the results, it will be your dog’s height. They are especially useful if you are considering buying a dog harness to prevent injuries around your dog’s health and its posture.

How To Select The Best Dog In The Litter?

Any dog you choose will be the best dog. Guaranteed.

Final Thoughts

Determining a puppy’s size can be an incredibly difficult task. Especially when your pup’s dog parents are not available or your dog is a mix of many breeds, you need to rely on rules of thumb or charts to get an estimate. The main factors influencing weight and size are breed, gender, the castration state. With our charts, we visualize puppy growth throughout two years. All together, the methods above will aid you in finding out more about your dog.


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