The transition from puppy to dog happens too fast for most owners, and the question is, when does a dog stop growing? Before adopting a puppy, one should be aware of the various stages of their growth.
Knowing the age of full growth helps you estimate how big your dog will get. This, in turn, helps you get right-sized essentials like harnesses, small or large-breed food, and even toy sizes. You can also predict when some puppy issues, like regular accidents, will cease (puppy pads help).
Not only that, but monitoring a dog’s growth and development can help identify potential health issues early on, allowing for timely intervention. We’ve backed our advice with expert sources like Alexandra Horowitz’s The Year of the Puppy for a comprehensive guide on puppy growth.
So, When Do Dogs Stop Growing?
A dog’s growth varies depending on several factors, such as breed, size, and nutrition. Generally, small breeds stop growing around 6 to 8 months of age, while larger breeds can take up to 12-36 months or more to reach their full size. However, it’s important to note that growth doesn’t necessarily mean maturity. A dog’s behavior and temperament can continue to develop well into adulthood.
While genetics play a significant role in a dog’s growth, proper nutrition and exercise are also crucial factors. A well-balanced diet and regular exercise can help ensure that a dog grows at a healthy rate.
Generally, smaller dog breeds like Chihuahuas tend to reach their full size earlier than larger breeds like Great Danes. Small breeds can reach their full size as early as 6-8 months, while larger breeds may not stop growing until they are 1-2 years old.
Nutrition also plays a vital role in a dog’s growth and development. A well-balanced diet that provides all the necessary nutrients is critical for a dog’s growth. Feeding a dog a low-quality diet or overfeeding can lead to health problems and stunted growth.
However, note that the age at which puppies stop growing differs from the age at which they mature. Attaining the age of maturity means a puppy has now become a dog, which you can read about in our linked article.
The table below shows the average age at which a couple of popular dog breeds reach their full size to provide a general idea of when different breeds stop growing.
| Breed | Average Age at Full Size |
| Chihuahua | 6-8 months |
| Pomeranian | 8-10 months |
| Dachshund | 8 to 10 months |
| Beagle | 8-12 months |
| Cocker Spaniel | 12-18 months |
| Bulldog | 12-18 months |
| Boxer | 18-24 months |
| Golden Retriever | 18-24 months |
| German Shepherd | 18-24 months |
| Labrador Retriever | 18-24 months |
| Rottweiler | 18-24 months |
| Siberian Husky | 18-24 months |
| Great Dane | 24-36 months |
| Mastiff | 24-36 months |
It’s important to note that these are just averages, and individual dogs may stop growing earlier or later than these estimates. It’s always best to consult a veterinarian to ensure a dog is growing and developing normally.
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Understanding Dog Growth
When it comes to understanding dog growth, there are a few essential factors to consider. Physical growth, psychological growth, and the closing of growth plates (physes) all play a role in a dog’s development.
Physical Growth
Physical growth refers to a dog’s increase in size and weight. This growth is most rapid during the first six months of a dog’s life and typically slows down after that. The breed of the dog can also affect how quickly they grow. Large breed dogs, for example, may continue to grow until they are two years old or more.
It’s important to note that overfeeding a dog can lead to excessive weight gain and growth. This can cause permanent bone and joint problems and other health issues.
Additionally, giving a puppy adult food may cause them to grow too fast. This will cause joint issues like arthritis and bone abnormalities later. Growing research shows that you must feed your puppy strictly puppy food until about two years old if they’re a large breed.
Psychological Growth
Psychological growth refers to a dog’s mental development. This includes their ability to learn, socialize, and adapt to new situations. A dog’s experiences during the first few months of their life can significantly impact their psychological growth. Dogs that experience trauma at this stage will likely carry that on, and those raised to be confident dogs will grow up that way.
Proper socialization and training are essential for a dog’s psychological growth. This can help them develop into well-behaved and confident adults.
Sexual Development
Small breed dogs typically attain sexual maturity at around six months, while the age is 9 to 12 months for larger breeds. During this phase, both male and female dogs become capable of reproduction, with females entering their first heat cycle and males displaying more pronounced sexual behaviors.
Related:
Can a dog get pregnant when not in heat?
Closing Growth Plates (Physes)
Growth plates, also known as physes, are areas of cartilage that allow bones to grow. As a dog matures, these growth plates begin to close and harden, eventually becoming solid bone. The timing of this process can vary depending on the breed of the dog.
Sources show that you should avoid over-exercising young dogs, as this can put stress on their developing bones and joints. Consult a veterinarian to determine the appropriate amount of exercise for a growing dog. A good rule of thumb
Factors Influencing Dog Growth
Breed
A dog’s breed is one of the most significant factors influencing growth. Larger breeds like Mastiffs grow much faster than smaller breeds like Pomeranians. The size and weight of a dog’s parents can also influence growth rate.
Nutrition
Nutrition is another crucial factor that affects a dog’s growth. A well-balanced diet with the right amount of protein, fat, and carbohydrates is essential for a dog’s growth and development.
Puppies require more calories and nutrients than adult dogs, and their diet should be adjusted accordingly. Overfeeding or underfeeding a dog can lead to growth problems, so monitoring their food intake and adjusting it as necessary is essential.
Health Conditions
Certain health conditions can affect growth rates. Dogs with pituitary dwarfism grow much slower than their same-age counterparts. Their small pituitary gland doesn’t produce enough growth hormones. Our article on dwarf German Shepherds covers dwarfism more extensively.
On top of pituitary dwarfism, medical conditions that affect growth include:
- Chondrodysplasia – small, stocky appearance;
- Chondrodystrophy – shortened legs; and
- Juvenile-onset hypothyroidism – disproportionate and reduced growth.
Other conditions, such as malnutrition, hormonal imbalances, and bone disorders, can also affect a dog’s growth. It’s essential to monitor a dog’s growth and development and seek veterinary care if any concerns arise.
Growth Stages in Dogs
Dogs go through different stages of growth throughout their life. Understanding these stages can help owners provide the best care for their furry friends. The growth stages in dogs are the puppy, adolescence, and adult stages.
Puppy Stage
The puppy stage is the first stage of a dog’s life, starting from birth and lasting until around 12 months of age. During this stage, puppies experience rapid growth and development. They learn basic skills such as walking, running, and playing. Puppies also develop their senses and learn to interact with their environment.
Puppies require a lot of care during this stage. They need a balanced diet to support their growth and development. Providing them with proper nutrition, including protein, vitamins, and minerals, is essential.
It is also important to monitor how many bones puppies chew. This is because they need a delicate calcium-to-phosphorus ratio of 1.1:1 and 1.4:1 calcium to phosphorus. The bones may supply too much calcium.
Puppies also need plenty of exercise and socialization to help them develop into healthy and well-adjusted adults.
Adolescence Stage
The adolescence stage starts at around six months of age and lasts until the dog reaches adulthood, typically around 12 to 24 months. During this stage, dogs experience more gradual growth and development. They continue to learn new skills and behaviors and become more independent.
Dog owners know how naughty dogs can get as adolescents. If you thought teenage drama only affects humans, you’re wrong. At this stage, dogs may get mischievous and choose not to listen to you just because they can. Adolescents are still considered puppies.
Also read: Why doesn’t my dog listen to me?
Adult Stage
The adult stage starts when the dog reaches physical maturity and lasts until the end of their life. During this stage, dogs reach their full size and weight and become more settled in their behavior. They require less exercise than during the previous stages but still need regular physical activity to maintain their health.
Adult dogs require a balanced diet that meets their nutritional needs. Owners should also provide them with regular veterinary care to help prevent and treat any health issues that may arise.
Signs Your Dog Has Stopped Growing
It can be difficult to determine when a dog has stopped growing, as different breeds grow at different rates and reach their full size at different ages. However, some signs to look out for can indicate that your dog has stopped growing.
1. Weight Stabilizes
One of the most obvious signs that your dog has stopped growing is when their weight stabilizes. Most dogs will reach their maximum weight by the time they are 1-2 years old, depending on their breed. If your dog’s weight has remained the same for several months, they have likely stopped growing.
2. Growth Plates Close
Growth plates are the areas of developing cartilage at the ends of bones in puppies that allow for growth. As a dog matures, these growth plates gradually close and turn into solid bone. X-rays can determine if a dog’s growth plates have closed, which can indicate that they have stopped growing.
3. Behavioral Changes
As dogs reach maturity, they become less energetic and start calming down. This can signify that they have stopped growing, as their bodies no longer require as much energy to support growth. Additionally, dogs may become more protective of their territory and less playful as they reach adulthood.
4. Coat Changes
A dog’s coat can also provide clues as to whether or not they have stopped growing. Puppies often have soft, fluffy coats that gradually become coarser and denser as they mature. If your dog’s coat has stopped changing and has reached its full texture and length, it’s likely that they have stopped growing.
When to Consult a Vet
While it is normal for dogs to grow at different rates, it is important to monitor their growth to ensure they are healthy. If you notice that your dog is not growing as expected, it is essential to consult a vet. Here are some situations where you should take your dog to the vet:
Slow Growth
If your dog is not growing as expected, it may be a sign of an underlying health issue. Various factors, including poor nutrition, hormonal imbalances, or genetic disorders can cause slow growth. If your dog is not growing normally, it is vital to take them to the vet to determine the underlying cause.
Rapid Growth
While it is normal for puppies to grow quickly, excessively rapid growth can also indicate an underlying health issue. Large-breed dogs are particularly susceptible to growth-related issues, such as hip dysplasia. If you notice that your dog is overgrowing, it is vital to take them to the vet to ensure they grow at a healthy rate.
Abnormal Growth
If you notice any abnormalities in your dog’s growth, such as lumps or bumps, it is essential to take them to the vet. Abnormal growth can be a sign of cancer or other serious health issues. The vet can determine the underlying cause and provide appropriate treatment.
Frequently Asked Questions (FAQs)
When is a dog no longer considered a puppy?
Dogs are generally considered puppies until they reach 1 to 2 years of age, after which they’re now dogs. However, the age at which a dog is no longer considered a puppy can vary depending on the breed and size of the dog.
When do Labrador dogs reach their full size?
Labrador dogs typically reach their full size between 12 and 18 months of age. However, some Labradors may continue to grow until they are two years old.
When do puppies experience the most growth?
Puppies experience the most growth during their first six months of life. During this time, they can grow up to 10 times their birth weight.
When do Golden Retrievers stop growing?
Golden Retrievers typically stop growing between 18 and 24 months of age. However, some Golden Retrievers may continue to grow until they are three years old.
When do small dog breeds reach their full size?
Small dog breeds typically reach their full size between 6-8 months of age. However, some small dog breeds may continue to grow until they are one year old.
At what age is a dog considered fully grown?
Dogs are generally considered fully grown when they reach their breed’s standard size. This can vary depending on the breed and size of the dog, but most dogs are fully grown by the time they are two years old.
Final Thoughts
There is no set age at which a dog stops growing. The growth rate varies depending on the dog’s breed, size, and genetics. However, most dogs reach their full size between 12 to 24 months of age, with small breeds attaining full sizes at 6 to 8 months.
It is important to note that while a dog may have reached their full height, they may still continue to gain weight and fill out until they reach maturity at around 2-3 years old. Overall, understanding the growth process of dogs can help owners provide the best care for their furry companions.
Meet Your Experts
Author
Tamsin de la Harpe has nearly two decades of experience with dogs in rescue, training, and behavior modification with fearful and aggressive dogs. She has worked closely with veterinarians and various kennels, building up extensive medical knowledge and an understanding of canine health and physiology. She also spent two years in the animal sciences as a canine nutrition researcher, focusing on longevity and holistic healthcare for our four-legged companions. Tamsin currently keeps a busy homestead with an assortment of rescue dogs and three Bullmastiffs.