From the pocket-sized Chihuahua to the majestic Great Dane, the world of dogs offers a size to fit every home and heart.
But how can you predict the adult size of that adorable puppy you’re eyeing?
Or, how can you get an estimate of the new dog you’ve just brought home?
Whether you’re contemplating adopting a puppy or just curious about canine growth, this guide is here to shed light.
Dive in to understand precisely what to expect in terms of size and the journey to maturity, ensuring you’re well-prepared for the delightful adventure ahead!
How Big Do Dogs Get?
Dogs vary greatly in size. Chihuahuas, the smallest, weigh around 2-6 lbs and stand 5-8 inches tall. Great Danes, among the largest, can weigh 110-200 lbs and reach 28-34 inches at the shoulder. Many breeds fall between these extremes.
Dogs are one of the most diverse species in terms of size, range from tiny teacup breeds to massive giants.
Factors That Influence A Dogs Size
Breed
The primary determinant of a dog’s size is its breed. Each breed has a standard size range, established through generations of selective breeding.
For instance, while a Chihuahua is bred for its petite size, breeds like the Mastiff or Saint Bernard are valued for their imposing stature.
Genetics
Genetics also play a crucial role. Even within a single breed, a dog’s lineage can influence its eventual size.
Puppies from larger parents tend to grow bigger than those from smaller parents.
Genetic anomalies can sometimes produce dogs that are significantly larger or smaller than the breed standard.
Health/Nutrition
Health and nutrition during a dog’s growth phase can significantly impact its adult size.
Malnutrition or health issues can stunt growth, while overfeeding can lead to obesity, making the dog appear larger.
Proper veterinary care and a balanced diet are essential for optimal growth.
Lifestyle Factors
Lifestyle factors, including exercise and diet, can also influence a dog’s size. A sedentary lifestyle can lead to weight gain, while an active one can promote lean muscle development.
However, it’s essential to note that while lifestyle can affect a dog’s weight and physique, it won’t change its skeletal size.
How Do You Tell How Big A Dog Will Get?
To estimate a dog’s adult size, consider its breed standard, observe the size of its parents, monitor its growth rate, and consult a veterinarian. Growth charts and formulas can also provide size predictions based on current weight and age.
Predicting a dog’s adult size can be both an art and a science.
Consider The Breed Average
The breed is often the most significant indicator. For instance, a Golden Retriever puppy will naturally grow larger than a Shih Tzu puppy due to inherent breed differences.
If you’re familiar with the breed, you can refer to breed standards which provide typical weight and height ranges.
Observe The Parental Dogs
Observing the parents, if possible, gives a direct insight.
A puppy from larger Labrador parents is likely to grow bigger than one from smaller Labradors.
However, mixed breeds can be trickier, as they might inherit characteristics from either parent or a blend of both.
Monitor Growth Rate
Monitoring a puppy’s growth rate is another method.
Some breeds, like German Shepherds or Boxers, have rapid growth spurts in their early months, while others, like the Dachshund, grow more steadily over a longer period.
Consult A Veterinarian
Veterinarians can provide valuable insights based on their experience and knowledge.
They might use growth charts or formulas that predict adult size based on current weight and age.
However, it’s essential to remember that while these methods can give a good estimate, individual variations always exist.
At What Age Is A Dog Fully Grown?
Most dogs reach their full size between 12-18 months. However, smaller breeds mature faster, often by 10-12 months, while larger breeds can take up to 24 months or longer to reach their full adult size.
The age at which a dog reaches its full size varies significantly across breeds due to genetic and physiological differences.
Smaller Breeds
Smaller breeds, such as Chihuahuas, Dachshunds, and Toy Poodles, tend to mature faster.
Most of them are fully grown by the age of 10-12 months. Their rapid growth phase means they reach adulthood quicker than their larger counterparts.
Medium-Sized Breeds
Medium-sized breeds like Beagles, Cocker Spaniels, and Border Collies typically reach their full size around the 12-15 month mark.
Their growth is steady, and by the end of their first year, they’re close to their adult size.
Larger Breeds
Larger breeds, including Golden Retrievers, Labrador Retrievers, and German Shepherds, usually take between 18-24 months to fully mature.
Their extended growth period is due to the significant size they attain as adults.
Giant Breeds
Giant breeds, such as Great Danes, Saint Bernards, and Mastiffs, can take even longer, sometimes up to 2.5-3 years to reach their full adult size.
Given their massive stature, their skeletal and muscular systems require more time to develop fully.
Dog Size Calculator
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Dog Sizes By Breed
Alaskan Malamutes
Alaskan Malamutes are powerful and sturdy dogs, originally bred for their strength to haul heavy freight. They have a deep chest, strong muscles, and a fluffy double coat.
- Typical Height: 23-25 inches
- Typical Weight: 75-85 pounds
- Full Adult Size Age: 18-24 months
Anatolian Shepherds
Anatolian Shepherds are rugged, large, and very protective, originally bred to protect livestock. They have a short to rough double coat and a powerful build.
- Typical Height: 27-29 inches
- Typical Weight: 80-150 pounds
- Full Adult Size Age: 2 years
Australian Shepherds
Known for their multicolored eyes and merle coat, Australian Shepherds are agile and intelligent, often used in herding.
- Typical Height: 18-23 inches
- Typical Weight: 40-65 pounds
- Full Adult Size Age: 16-20 months
Basenji Dogs
Basenjis, often called the “barkless dog,” have a sleek and fine coat, with a distinctively curled tail and alert expression.
- Typical Height: 16-17 inches
- Typical Weight: 22-24 pounds
- Full Adult Size Age: 12-14 months
Basset Hounds
With droopy eyes and long ears, Basset Hounds are charming and have a distinctive short-legged appearance.
- Typical Height: 12-15 inches
- Typical Weight: 40-65 pounds
- Full Adult Size Age: 18 months
Belgian Malinois
Belgian Malinois are often mistaken for German Shepherds due to their similar appearance. They are agile, muscular, and have a short, fawn-colored coat.
- Typical Height: 22-26 inches
- Typical Weight: 40-80 pounds
- Full Adult Size Age: 18-24 months
Blue Heelers
Also known as the Australian Cattle Dog, Blue Heelers are robust, hard-working, and have a unique blue-speckled or blue-mottled coat.
- Typical Height: 17-20 inches
- Typical Weight: 30-50 pounds
- Full Adult Size Age: 12-15 months
Border Collies
Known for their intelligence and agility, Border Collies have a variety of coat colors and are often seen in agility competitions.
- Typical Height: 18-22 inches
- Typical Weight: 30-45 pounds
- Full Adult Size Age: 12-15 months
Bernese Mountain Dogs
These gentle giants have a tri-colored, thick coat and are known for their strength and friendly demeanor.
- Typical Height: 23-28 inches
- Typical Weight: 70-115 pounds
- Full Adult Size Age: 2-3 years
Bull Terriers
Distinctive for their egg-shaped head and small, triangular eyes, Bull Terriers are muscular and have a short, dense coat.
- Typical Height: 18-22 inches
- Typical Weight: 50-70 pounds
- Full Adult Size Age: 12-18 months
Bullmastiffs
Bullmastiffs are powerful dogs with a solid build and a short muzzle. They have a short coat and are known for their protective nature.
- Typical Height: 24-27 inches
- Typical Weight: 100-130 pounds
- Full Adult Size Age: 2-2.5 years
Brittany Spaniels
Brittany Spaniels, often simply referred to as “Brittanys,” are known for their energetic nature and keen hunting instincts. With a dense, wavy coat and expressive eyes, they are both hardworking in the field and affectionate at home.
- Typical Height: 17.5-20.5 inches
- Typical Weight: 30-40 pounds
- Full Adult Size Age: 12-14 months
Chocolate Labradors
A variation of the Labrador Retriever, Chocolate Labs are friendly, outgoing, and have a smooth, short, chocolate-colored coat.
- Typical Height: 21-24 inches
- Typical Weight: 55-80 pounds
- Full Adult Size Age: 12-18 months
Cocker Spaniels
Cocker Spaniels have a silky, medium-length coat and are known for their gentle and affectionate nature.
- Typical Height: 13.5-15.5 inches
- Typical Weight: 20-30 pounds
- Full Adult Size Age: 12-15 months
Dachshunds
Often called “wiener dogs” due to their long body and short legs, Dachshunds are playful and curious.
- Typical Height: 8-9 inches (standard)
- Typical Weight: 16-32 pounds (standard)
- Full Adult Size Age: 12-14 months
Dalmatians
Known for their distinct black or liver-spotted coat, Dalmatians are energetic and have a strong, muscular build.
- Typical Height: 19-24 inches
- Typical Weight: 45-70 pounds
- Full Adult Size Age: 14-18 months
Dutch Shepherds
Dutch Shepherds are loyal and reliable, with a brindle coat and a well-proportioned body.
- Typical Height: 21.5-24.5 inches
- Typical Weight: 40-75 pounds
- Full Adult Size Age: 18-24 months
French Mastiffs
Also known as Dogue de Bordeaux, French Mastiffs have a powerful build, a short coat, and a distinctive wrinkled face.
- Typical Height: 23-27 inches
- Typical Weight: 99-110 pounds
- Full Adult Size Age: 2-3 years
German Shorthaired Pointers
These dogs are versatile hunters with a sleek coat and a well-muscled body.
- Typical Height: 21-25 inches
- Typical Weight: 45-70 pounds
- Full Adult Size Age: 18-24 months
Great Pyrenees
Great Pyrenees are known for their majestic white coat and gentle nature, often used as livestock guardians.
- Typical Height: 25-32 inches
- Typical Weight: 85-160 pounds
- Full Adult Size Age: 2-3 years
Greyhounds
Greyhounds are slim and athletic, known for their incredible speed and short, smooth coat.
- Typical Height: 27-30 inches
- Typical Weight: 57-88 pounds
- Full Adult Size Age: 18 months
Irish Wolfhounds
One of the tallest breeds, Irish Wolfhounds have a rough coat and a gentle demeanor.
- Typical Height: 30-35 inches
- Typical Weight: 140-180 pounds
- Full Adult Size Age: 2 years
Leonbergers
Leonbergers have a thick, medium-length coat and are known for their gentle and friendly nature.
- Typical Height: 25.5-31.5 inches
- Typical Weight: 90-170 pounds
- Full Adult Size Age: 3 years
Lhasa Apsos
Lhasa Apsos have a long, flowing coat and are known for their keen sense of hearing and alert disposition, often serving as watchful companions.
- Typical Height: 10-11 inches
- Typical Weight: 12-18 pounds
- Full Adult Size Age: 12-14 months
Maltese
Maltese dogs are known for their luxurious white coat and spirited, playful nature, making them popular companions.
- Typical Height: 7-9 inches
- Typical Weight: 4-7 pounds
- Full Adult Size Age: 12 months
Miniature Pinschers
Often mistaken for tiny Dobermans, Miniature Pinschers are energetic, with a sleek coat and a confident demeanor.
- Typical Height: 10-12.5 inches
- Typical Weight: 8-12 pounds
- Full Adult Size Age: 10-12 months
Newfoundlands
Newfoundlands are gentle giants, known for their swimming abilities and thick, water-resistant coat.
- Typical Height: 26-28 inches
- Typical Weight: 100-150 pounds
- Full Adult Size Age: 2-3 years
Papillons
Named for their butterfly-like ears, Papillons are lively and have a silky, flowing coat.
- Typical Height: 8-11 inches
- Typical Weight: 5-10 pounds
- Full Adult Size Age: 10-12 months
Pomeranians
Pomeranians are small but spirited, with a fluffy double coat and a fox-like expression.
- Typical Height: 6-7 inches
- Typical Weight: 3-7 pounds
- Full Adult Size Age: 10-12 months
Portuguese Water Dogs
Originally bred for fishing, these dogs have a curly or wavy coat and are known for their intelligence and energy.
- Typical Height: 17-23 inches
- Typical Weight: 35-60 pounds
- Full Adult Size Age: 18-24 months
Puggles
A cross between Pugs and Beagles, Puggles have a wrinkled face, short coat, and a playful nature.
- Typical Height: 13-15 inches
- Typical Weight: 18-30 pounds
- Full Adult Size Age: 12-14 months
Rat Terriers
Rat Terriers are agile and alert, with a short coat and a muscular build, often used for hunting and farm work.
- Typical Height: 10-18 inches
- Typical Weight: 10-25 pounds
- Full Adult Size Age: 12-16 months
Redbone Coonhounds
Known for their deep red coat, Redbone Coonhounds are agile hunters with a keen sense of smell.
- Typical Height: 21-27 inches
- Typical Weight: 45-70 pounds
- Full Adult Size Age: 18-24 months
Rhodesian Ridgebacks
Distinctive for the “ridge” of hair along their back, these dogs are muscular and were originally bred for lion hunting.
- Typical Height: 24-27 inches
- Typical Weight: 70-85 pounds
- Full Adult Size Age: 18-24 months
Saint Bernards
Saint Bernards are gentle giants, known for their rescue work in the Alps and their friendly disposition.
- Typical Height: 26-30 inches
- Typical Weight: 120-180 pounds
- Full Adult Size Age: 2-3 years
Samoyeds
Samoyeds are known for their bright white, fluffy coat and their friendly “Sammy smile.”
- Typical Height: 19-23.5 inches
- Typical Weight: 35-65 pounds
- Full Adult Size Age: 18-24 months
Shelties
Also known as Shetland Sheepdogs, Shelties are agile, intelligent, and have a long, thick coat.
- Typical Height: 13-16 inches
- Typical Weight: 15-25 pounds
- Full Adult Size Age: 12-18 months
Shiba Inus
Shiba Inus are small, agile dogs with a fox-like appearance, known for their spirited nature.
- Typical Height: 13.5-16.5 inches
- Typical Weight: 17-23 pounds
- Full Adult Size Age: 12-18 months
Springer Spaniels
Springer Spaniels are energetic, with a silky coat and a love for retrieving.
- Typical Height: 19-20 inches
- Typical Weight: 40-50 pounds
- Full Adult Size Age: 18-24 months
Teacup Pomeranians
A smaller version of the standard Pomeranian, Teacup Pomeranians are tiny but full of personality.
- Typical Height: 4-6 inches
- Typical Weight: 2-5 pounds
- Full Adult Size Age: 10-12 months
Teacup Poodles
Teacup Poodles are a miniature version of the standard Poodle, known for their intelligence and curly coat.
- Typical Height: 8-10 inches
- Typical Weight: 2-5 pounds
- Full Adult Size Age: 10-12 months
Tibetan Mastiffs
Tibetan Mastiffs are known for their thick mane and protective nature, often serving as guardians.
- Typical Height: 24-26 inches
- Typical Weight: 70-150 pounds
- Full Adult Size Age: 3-4 years
Weimaraners
Weimaraners are sleek, silver-gray dogs known for their stamina and hunting abilities.
- Typical Height: 23-27 inches
- Typical Weight: 55-90 pounds
- Full Adult Size Age: 18-24 months
Whippets
Whippets are slim and graceful, often referred to as a smaller version of the Greyhound.
- Typical Height: 18-22 inches
- Typical Weight: 25-40 pounds
- Full Adult Size Age: 12-18 months
Note: The sizes mentioned are general averages and can vary based on individual genetics and care.
Dog Sizes By Mixed Breed
Aussiedoodles
A delightful mix of the Australian Shepherd and Poodle, Aussiedoodles are known for their wavy to curly coat and their playful, intelligent nature.
- Typical Height: 14-23 inches
- Typical Weight: 25-70 pounds
- Full Adult Size Age: 12-18 months
Bernedoodles
Combining the Bernese Mountain Dog and Poodle, Bernedoodles have a curly or wavy coat and are known for their affectionate and loyal nature.
- Typical Height: 12-29 inches (varies from toy to standard size)
- Typical Weight: 10-90 pounds
- Full Adult Size Age: 12-24 months
Cavachons
A blend of the Cavalier King Charles Spaniel and Bichon Frise, Cavachons are small, with a soft, curly coat and a friendly disposition.
- Typical Height: 12-13 inches
- Typical Weight: 15-20 pounds
- Full Adult Size Age: 12-14 months
Cavapoos
A mix of the Cavalier King Charles Spaniel and Poodle, Cavapoos are affectionate, with a wavy to curly coat.
- Typical Height: 9-14 inches
- Typical Weight: 7-20 pounds
- Full Adult Size Age: 12-15 months
Cavoodles
Another name for Cavapoos, Cavoodles have the same charming characteristics and size range.
- Typical Height: 9-14 inches
- Typical Weight: 7-20 pounds
- Full Adult Size Age: 12-15 months
Doxiepoo
Doxiepoos, a mix between Dachshunds and Poodles, are known for their unique appearance, combining the long body of a Dachshund with the curly coat of a Poodle. They are playful, affectionate, and make great companions.
- Typical Height: 8-21 inches (depending on whether the Poodle parent is toy, mini, or standard)
- Typical Weight: 10-30 pounds
- Full Adult Size Age: 12-18 months
Maltipoos
A delightful blend of the Maltese and Poodle, Maltipoos are small with a curly or wavy coat, known for their gentle and affectionate nature.
- Typical Height: 8-14 inches
- Typical Weight: 5-20 pounds
- Full Adult Size Age: 10-15 months
Morkie Poos
A mix of Maltese, Yorkie, and Poodle, Morkie Poos are tiny, with a soft, wavy coat and a playful demeanor.
- Typical Height: 8-12 inches
- Typical Weight: 5-15 pounds
- Full Adult Size Age: 10-14 months
Pomapoos
Combining the Pomeranian and Poodle, Pomapoos are small, with a fluffy, curly coat and a lively nature.
- Typical Height: 8-10 inches
- Typical Weight: 5-15 pounds
- Full Adult Size Age: 10-12 months
Pomchi
Pomchis are a delightful mix between Pomeranians and Chihuahuas. They are known for their small stature, spirited personality, and often have a fluffy coat reminiscent of the Pomeranian parent. Their lively nature and compact size make them popular apartment pets.
- Typical Height: 6-9 inches
- Typical Weight: 5-12 pounds
- Full Adult Size Age: 10-12 months
Schnoodles
A blend of the Schnauzer and Poodle, Schnoodles have a curly or wavy coat and are known for their intelligence and friendly nature.
- Typical Height: 10-26 inches (varies from mini to standard size)
- Typical Weight: 10-75 pounds
- Full Adult Size Age: 12-24 months
Sheepadoodles
A mix of the Old English Sheepdog and Poodle, Sheepadoodles have a soft, curly coat and are known for their gentle and playful nature.
- Typical Height: 16-28 inches
- Typical Weight: 60-80 pounds
- Full Adult Size Age: 18-24 months
Whoodles
Combining the Soft-Coated Wheaten Terrier and Poodle, Whoodles have a soft, wavy coat and a friendly disposition.
- Typical Height: 12-20 inches
- Typical Weight: 20-45 pounds
- Full Adult Size Age: 12-18 months
Yorkipoos
A delightful blend of the Yorkshire Terrier and Poodle, Yorkipoos are small, with a silky, wavy coat and a spirited nature.
- Typical Height: 7-15 inches
- Typical Weight: 3-14 pounds
- Full Adult Size Age: 10-14 months
Note: The sizes mentioned for mixed breeds can vary widely based on the dominant parent breed and individual genetics.
I am an experienced pet owner with decades of experience owning a number of different pets, from traditional pets like dogs and cats, to the more exotic like reptiles and rodents. I currently own a Cockapoo (pictured) called Bailey. I am also the main writer and chief editor here at Pet Educate; a site dedicated to sharing evidence-based insights and guidance, based on my vast pet ownership knowledge, experience, and extensive research.