Australian Shepherds are an excellent dog to have as part of your family. They are highly intelligent, very active, love to please their owners, and do not get to be extremely large. But they are not tiny dogs.

So when do Australian Shepherds stop growing?

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This helpful guide goes over the impacting factors of how big your Australian Shepherd gets and when you can expect them to stop growing.

The Growth Cycle of an Australian Shepherd

You may not realize it, but your Australian Shepherd will grow to its full height before reaching its total weight. Although this characteristic is common among dogs, smaller Australian Shepherds will generally stop growing sooner than standard-sized ones.

A standard Australian Shepherd will generally reach their total height and weigh between 16 and 18 months. Alternatively, miniature variations will often stop growing by 12 to 16 months of age.

Here is a more detailed breakdown of the growth cycle for a standard-size male Australian Shepherd from puppy to adult.

Australian Shepherd Growth Chart (Male)

This table details the puppy to adult growth cycle for a standard-size female Australian Shepherd.

Australian Shepherd Growth Chart (Female)

Dog lovers can typically expect their Australian Shepherd to stop growing between the ages of one and two years. Although your four-legged friend may reach their total height at 12 months, they usually take a bit more time to fill out and get to their final body weight.

It is obvious how quickly this breed grows in the first eight or nine months, but it begins to slow down near this time. So although your Australian Shepherd still has growing to do, it will be less rapid than their puppy stage.

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However, some crucial elements can affect the growth rates and adult size.

The Average Australian Shepherd Size

The average Australian Shepherd is a medium-sized dog that is a perfect companion on those long hikes or as an adventure buddy. However, some breeders offer miniature Australian Shepherds, providing a more compact version of this lovable dog.

For comparison, the average fully-grown Australian Shepherds measure:

Standard Males:

• Height at withers: 20” to 23”
• Length: 31” to 36”
• Weight: 55 to 70 lbs (25 to 32 kg)

Standard Females:

• Height at withers: 18” to 21”
• Length: 28” to 31”
• Weight: 33 to 55 lbs (16 to 25 kg)

Miniature Males:

• Height at withers: 14” to 18”
• Length: 20” to 28”
• Weight: 20 to 40 lbs (9 to 18 kg)

Miniature Females:

• Height at withers: 13” to 17”
• Length: 20” to 28”
• Weight: 20 to 40 lbs (9 to 18 kg)

However, some elements will alter how big your four-legged friend gets. Some factors that help determine the size of an Australian Shepherd include:

• Sex
• Age
• Genetics
• Activity level
• Breed

Sex

Naturally, male and female dogs can vary in size, with the males averaging slightly larger. In addition, Australian Shepherds that undergo spay or neuter surgery tend to weigh more due to a decrease in hormones.

Alternatively, some may argue that if a dog is spayed or neutered too early, it could hinder its growth, making them a more petite adult. However, there is yet to be significant data to support this claim, and many dogs undergo this sterilization surgery well before their sexual maturity without ill effects.

Age

The age of your dog will indicate its average size. For example, an Australian Shepherd that’s around five months old should be half of their grown weight and height. Doubling their measurements at 20 weeks will provide a reasonable estimate of their final size as adults.

Genetics

Like other animals, genetics come into play when examining how big an Australian Shepherd will get. Dogs with larger or smaller parents are more likely to take on those traits, keeping them smaller or larger than average.

Genetics can also determine if your Aussie will face health problems that could interfere with their body weight. For example, some animals will have ailments, such as Cushing’s Disease or hypothyroidism, resulting in your dog weighing more than one with a clean bill of health.

Activity Level

The activity level of your Australian Shepherd may not alter how tall they grow, but it will affect how much they weigh. This breed is highly active and intelligent, making them medium to high-energy dogs that require ample exercise with a proper diet.

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Thankfully, this activity level keeps Australian Shepherds relatively lean and fit. However, remember that an active dog should receive a healthy, balanced diet, and if they are not exercising enough, too many high-calorie foods and treats will make them gain weight.

Breed

Although you may choose an Australian Shepherd for your next pet, it may not be purebred. Unless you have certification from a breeder of its bloodlines and breeding stock, there is a chance it could be a mixed breed.

While mixed breeds are still terrific animals to own and crossing an Aussie with another dog breed does not pose any problems, this element can affect their growth.

For example, if your dog has a parent smaller in stature than a standard Australian Shepherd, they may stop growing around the 12-month mark and remain on the small side.

Conversely, dogs who come from a mix with a larger breed, such as a Labrador or Mastiff, may continue to grow well past the 16-month mark and be overly large compared to a standard Australian Shepherd.

If My Australian Shepherd Is Smaller Than Normal or Seems To Stop Growing, Is Something Wrong?

Dogs are unique, much like people. They may carry their parent’s traits or differ from them. Therefore, guessing the size of your Australian Shepherd and when they stop growing is not an exact science.

Some dogs will stop growing earlier than others, around the 16-month mark, while others may continue growing until they reach two years of age. If your dog is not exhibiting any other health concerns, there is usually nothing to worry about.

However, dogs that stop growing extremely early or seem to have stunted growth should see a qualified veterinarian for a complete exam. This professional can rule out any genetic disorders or problems that may interfere with your pet’s growth and development.

So, When Do Australian Shepherds Stop Growing

The Australian Shepherd is a terrific dog to have by your side at home or while on an adventure. Knowing how big it will get and when Australian Shepherds stop growing will help you prepare for your new pet and keep them healthy and happy while living with you.

Dog lovers can expect their Australian Shepherd to stop growing around 16 to 18 months old, as they will reach their final height around 12 months and finish filling out before they turn two. Once your pet is two years old, it will be fully grown and should not grow any further.

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