When Do Dogs Fully Stop Growing

Dog Health Recent August 28, 2022

When Do Dogs Fully Stop Growing

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As hard as it can be to admit, all puppies will become dogs one day (although a little less energy is something to look forward to). The question is: when? There are three main factors in determining when a puppy will stop growing:

  • Breed
  • Other genetic factors
  • Sex

Here’s a more in-depth look into when, and why, you can expect your puppy to stop growing—plus the full sccop on their emotional growth, which happens in tandem with their physical development.

Here are some averages ages for maturation of different breed sizes.

Small Breed Dogs

Dr. Walker classifies small breed dogs as those under 25 pounds when fully grown.

Small dogs include breeds such as the DachshundMalteseYorkshire TerrierToy PoodleChihuahua and Bichon Frisé.

Dr. Walker says that small breed dogs typically start growing rapidly at 4-6 months and reach their full size between 10-12 months.

Medium Breed Dogs

Medium dog breeds, or pets that weigh between 22 and 50 pounds as adults, typically stop growing between 8 to 12 months.Dr. Walker classifies medium breed dogs as typically between 25-50 pounds when fully grown. Medium breeds include BeaglesBasset Hounds and Miniature Schnauzers.

“We expect medium size dogs to double their size between 8-12 weeks,” says Dr. Walker. Medium breeds reach full growth between 12-15 months.

“Sometimes, they may grow a little after that,” says Dr. Walker.

Large Breed Dogs

Large dog breeds, which reach a weight of 50 to 100 pounds as adults, stop growing at around 10 to 16 months. Large breed dogs are typically over 50 pounds and include breeds such as Labrador RetrieversBoxersPit BullsGolden RetrieversGerman Shepherds and Collies.

“Large breed dogs will also double their size between 8-12 weeks, but then the growth slows,” says Dr. Walker. She adds that large breed dogs will typically reach full growth at 18 months.

Giant Breed Dogs

Giant dog breeds, which are anywhere from 100 pounds to more than 200 pounds at full size, stop growing at around 10 to 16 months.Giant breed dogs include the Saint BernardGreat DaneMastiff and Great Pyrenees. These dogs, according to Dr. Walker, take the longest to develop, due to their huge skeletal frame.

“They will be at full growth potential by 18-24 months, but could take up to three years to reach their full weight,” says Dr. Walker. “Until that time, they may appear lanky.”

Male vs. Female

Male and female puppies of the same breed will grow at similar rates, and they’ll stop growing around the same time. But females will generally end up being smaller than males. Even within the same litter of purebred dogs, individual pups of both sexes will vary somewhat in size. The size discrepancies may be even greater in mixed-breed puppies since they carry the DNA of different breeds.

Final Thoughts

One of the most joyous moments in life is bringing home a new dog, regardless of age and breed. Puppies are usually the most popular choice for families looking for a family pet, excited to watch their new bundle of joy grow and bond with everyone. But things can quickly become chaos when the mixed-breed puppy your family adopted doesn’t stop growing. When should you expect your puppy to stop growing?

Woman scratching dog under chin

Amy Brown - Towry is a Certified NAVC Pet Nutritionist and pet lover. She is the proud owner of two rescue cats and a rescue dog and her love for animals has led her to a successful career as a freelance writer specializing in pet care, nutrition, and product reviews.
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