Knowing how long dogs live can give you some idea as to how big your pet will be. Thus, you will be able to offer them the space they require and help satisfy all their needs. Sometimes, not only is there an age at which growth stops, but there are breeds that tend to grow larger than others. 

Until how many months does a dog grow

We will start by specifying what is the age at which any dog ​​stops growth. A good way to tell is to determine when your dog reaches maturity. For this, your dog’s weight must be taken into account. If your dog is a small breed, he/she will stop growing when they are 1 year old. On the other hand, if your pet is a medium-breed dog, this time period can be extended up to 18 months.

What happens to big dogs? Well, they will also stop growing at 18 months like the medium breeds. However, the same does not happen with dogs who are considered giant breeds. In these cases, you will have to wait for about 2 years for your dog to complete his/her growth process. Now, despite taking the breed’s size into account, the type of race also matters, so we are going to take that into account.

How old do dogs grow?

Growth of dogs according to their breed

It is important to know that the growth of the dog will not only determine its anatomy but also its behavior as a dog, a factor that is also influenced by the breed to which it belongs. Let’s see how the growth process is, from start to finish, of the main breeds of dogs. 

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Border Collie

How long does a Border Collie grow? You must bear in mind that this is a medium-breed dog, so it will reach maturity at 18 months at most. However, their growth may stop at 14 months, something which is quite common.

Maltese Bichon

In the case of the Maltese Bichon, they usually stop growing at 10 months. It is not a large dog, in fact, it belongs to what we consider small breeds and after 6 months they tend to grow in width.


What size to expect from an adult Yorkshire? Their growth estimate is similar to that of the Maltese, although they may grow much sooner. There are very small Yorkshire breeds, such as the Yorkshire Terrier.

Toy poodle

Assuming that your dog’s breed is a Toy Poodle, you should expect them to grow up to a year, but no more. In fact, their growth does not usually exceed 28 centimeters. Therefore, keep this in mind because they will grow quickly.


If you are wondering about the size of a  Labrador, you should know that we are dealing with a large dog with a fairly strong constitution. Although it should grow up to 18 months, it usually finishes growing by the end of the year.

German shepherd

How long does a German Shepherd grow? A dog with these characteristics often exceeds expectations. Although they should stop growth at 18 months, there are cases in which they grow up to 2 years. This should be kept in mind.

Golden Retriever

Going back to the medium breeds, what to expect from the size of a Golden Retriever? They usually have accelerated growth until they are 10 months old. At this point, two things can happen: stop growing or continue until 18 months.


If you have this adorable dog with you, a Poodle, you should know that it usually grows up to one year old if it is a small breed and almost 2 years old if it’s a giant breed. So keep this in mind because this matters.


This breed of dog is considered medium, so they will finish growing at 14 months, but they can continue to develop their muscles up to 18 months.

French Bulldog

How big is a French Bulldog capable of growing? This small, flat-faced dog breed ends its growth at 12 months, some even a little earlier at 10 months. It will never be a dog that exceeds 35 centimeters, keep that in mind.

And the mongrel/mixed-breed dogs?

To determine how long mixed-breed dogs grow, the above recommendations can be followed, although, they usually stop their growth at approximately 18 months. In general, mixed-breed dogs are usually of medium size, so they are within the common range to know when the growth is going to stop.

Now that you know how long it takes for dogs to grow, would you know how to determine when yours stopped growing? If you have included a young dog in your family, take into account the aspects that we have mentioned because they will give you clues about when your dog’s growth will stop. Thus, you will know much more about your faithful companion.

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