When is a Dog Full Grown ?

Are you wondering when your dog is fully grown? You’re not alone. Veterinarians, dog registries and shelters, and even pet owners often use different timeframes to determine when a dog is full-grown. These are some of the most common age ranges given for a canine’s growth stages:

How Do Dogs Grow?

There are a lot of factors that go into how fast a dog will grow. Their breed, size, and health all play a role in their growth rate. However, there are some general guidelines you can follow to get an idea of when your dog will be full grown. Small breeds typically reach their full size by 9-12 months old, while larger breeds may take up to two years to reach their adult size. Regardless of breed, all dogs should be fully grown by the time they are two years old.

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When Does a Dog Reach its Full Size?

A dog reaches its full size when it is between one and two years old. However, some breeds of dogs continue to grow until they are three years old.

What is the Average Weight of a Full Grown Dog?

The average weight of a full grown dog can vary depending on the breed. For example, a Chihuahua will typically weigh between 3 and 6 pounds when full grown, while a Saint Bernard can weigh anywhere from 120 to 200 pounds.

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What Do Other Signs Indicate when a Dog is Fully Grown?

As your dog grows, you’ll notice other changes besides the obvious physical ones. Here are some things to look for that may indicate your dog has reached full size:

-Suppression of the “puppyish” behavior. This includes chewing, nipping, and playfulness. As your dog matures, he will start to calm down and become more sedate.

-A decrease in energy levels. This doesn’t mean your dog will become lazy, but he won’t have the same boundless energy he did as a puppy.

-An increase in sleeping hours. Just like humans, dogs need more sleep as they get older. If your dog is napping more often or sleeping through the night, it’s a sign he’s growing up.

-A change in eating habits. As your dog matures, his appetite will change and his food intake will adjust accordingly. He may also start to prefer adult dog food over puppy food.


Dogs reach full growth at different rates depending on their breed. Smaller breeds generally mature faster than larger breeds. Most dogs are fully grown by the time they are 18 months old, though some may continue to fill out and gain muscle mass until they are two years old. If you’re unsure about when your dog will be fully grown, ask your veterinarian for advice.

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