When is a Cockapoo Full Grown? (with Photos)

Cockapoo puppies are adorable, and you certainly don’t want to rush their growth, given that it feels like they become adults quickly. Nevertheless, knowing the size that a puppy will become is essential for ensuring you have adequate space for them.

So, are you wondering, “When is a Cockapoo full grown, and how can you tell?”

cockapoo full grown

You can be confident that a Cockapoo is fully grown by the time they’re two years old. But most of the time, it happens sooner.

I’ll walk you through the nuances of what impacts a Cockapoo’s growth to help give you an estimate of how big your new four-footed best friend might get.

The Timeline of Cockapoo Puppy Growth

According to veterinarians, small dogs stop growing when they’re six to eight months old. So, it’s reasonable to assume that a Toy Cockapoo puppy might already be full-grown by the time they reach eight months of age.

sitting Cockapoo on a bench
A Cockapoo sitting on a bench. (Image: Instagram/@adventures_of_toni)

In contrast, medium-sized dogs often stop growing by 12 months old, and large breeds can take anywhere from 12 – 24 months to reach their adult size.

Therefore, you can feel confident that your Cockapoo has stopped growing by the time they’re two years old.

Cockapoo puppy sits outside
Cockapoo puppy sits outside wearing a harness.

Changes in Growth Rates

If it feels like your newborn Cockapoo puppy grows bigger by the day, that’s spot-on. 

In their first four weeks of life, Cockapoos grow nearly 25% of their total body size. By the time they reach one year old, they’re well over 90% of their total body size, if not already 100% of their adult size.

So, the good news is that newborn Cockapoos grow exponentially fast, with the rate of their growth tapering out as they age. 

Your Cockapoo will grow fastest during its first four to five months of life before its growth rate slows significantly.

Estimating a Cockapoo Puppy’s Adult Body Weight 

If you’re hoping for a Toy Cockapoo lap dog, you’re likely concerned with how heavy your Cockapoo might become. 

Although the weight of your adult Cockapoo will largely depend on the quality and quantity of their food, along with how much exercise you give them, below is a chart showcasing the estimated weight calculations you can make.

Cockapoo’s AgeNumber To Multiply To Estimate Adult Weight
4 weeks4
12 weeks2
24 weeks1.25
Cockapoo sitting on the rocks
The Cockapoo puppy is on a quick break. (Image: Instagram/@ollie_the_red_cockapoo)

Understanding a Cockapoo Parent’s Sizes

Before we talk about the many Cockapoo size variations, it’s important to understand the why behind it. That boils down to a Cockapoo’s genetics from its parents.

The Cockapoo is a mix between the Cocker Spaniel, a naturally small dog, and the Poodle, which ranges in size.

Cocker Spaniel Size

The Kennel Clubs, which dictate official dog breeds, states that the Cocker Spaniel is the smallest sporting Spaniel registered with them.

These dogs grow 13.5 to 14.5 inches tall and weigh between 20 to 30 pounds.

Unlike the Poodle, there’s little variation in the Cocker Spaniel’s size. You can expect female Cocker Spaniels to be at the lower height range and males to be at the higher end.

Cocker Spaniel runs away
Cocker Spaniel runs on the field.

Poodle Size

A Cockapoo’s size varies because of its Poodle parent. That’s because Poodles come in the following three varieties:

  • Standard Poodle: Over 15 inches tall, weighs 40 to 70 pounds.
  • Miniature Poodle: Between 10 to 15 inches tall, weighs 10 to 15 pounds.
  • Toy Poodle: Less than 10 inches tall, 4 to 6 pounds.

Although Poodles have a range of sizes, that’s the only differentiator between them; they come in the same colors and coat types and have the same genetic makeup that causes them to be loyal, family-oriented pets.

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The Three Cockapoo Sizes

Would you like the good or bad news first?

Let’s start with the good news—regardless of the size your Cockapoo puppy ultimately becomes, these are excellent, loving dogs. 

The downside is that it isn’t possible to know how large a Cockapoo will grow until they’re about two years old. 

Nevertheless, purchasing your Cockapoo from a responsible breeder will help indicate how large your puppy may get, given that you’ll have their family history. Below is a breakdown of the three Cockapoo size types.

Toy Cockapoo Size

Toy Cockapoos, which people also call Teacup Cockapoos, grow up to ten inches tall. They aren’t as small as some true teacup dog varieties, but they’re truly tiny, weighing around six pounds.

As you can imagine, breeders pair Cocker Spaniels with Toy Poodles to produce the Toy Cockapoo.

A Toy Cockapoo can be an excellent fit if you live in a small apartment or don’t have the time to take a high-energy dog on lots of vigorous exercise outings. 

Miniature Cockapoo Size

Miniature Cockapoos are small to mid-size dogs, measuring anywhere from over ten to 16 inches tall. They typically weigh in the 15-pound range.

The Miniature Cockapoo results from breeding a Cocker Spaniel with a Miniature Poodle

Because of a Cocker Spaniel’s small size, breeding this pair together rarely results in an excessively large Cockapoo. However, gene variations can cause anything to happen.

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Standard Cockapoo Size

If you want the largest Cockapoo possible, it’s crucial to ensure the Poodle parent is Standard size. 

Standard Cockapoos, which some people call Maxi Cockapoos, have a height ranging from over 16 inches to more than 18 inches tall. 

Offering Standard Cockapoos plenty of space to run and explore is crucial to their well-being.

Cockapoo straight coat
Cockapoo with straight coat standing in the yard.

Why It’s Hard To Determine a Cockapoo’s Size?

When asking the question, “When is a Cockapoo full grown?” the answer isn’t as straightforward as most dog owners would like.

The reason why it’s hard to determine a Cockapoo’s size is that the Poodles come in such an extensive range of sizes. Even within one of the three size categories, a Poodle can be at the lower or higher end, making it nearly qualify for a different size category.

So, if you have your heart set on a tight Cockapoo size range, the best option is to purchase a full-grown Cockapoo that’s at least two years old.

Cockapoo puppy on a Halloween
Cockapoo puppy on a Halloween celebration with pumpkin at the back.

But since I know many people enjoy raising puppies, the next best option is to ask for detailed records of a Cockapoo puppy’s lineage from a breeder.

Knowing whether the Cockapoo’s Poodle parents and grandparents were Toy, Miniature, or Standard Poodles isn’t enough. You need to know their exact height to best determine the likelihood of their offspring’s size. 

Even then, there’s no guarantee your Cockapoo puppy will grow into the size you and your breeder estimate. 

Cockapoo on owner's lap
Cockapoo is climbing on his owner’s lap for a cuddle!

How To Support Cockapoo Growth?

You might want your Cockapoo to stay a puppy forever, but we all know this isn’t possible. So, you should follow the guidelines below to help your puppy grow into a healthy and genetically predisposed size.

  • Purchase high-quality food.
  • Ensure the food has balanced macronutrients.
  • Exercise your puppy in moderation.

Cockapoo puppies require more protein than when they’re adults (29% compared to 18%), which is why it’s so important to feed your puppy age-appropriate dog food.

That said, feeding your puppy too much protein can also lead to issues, particularly with their skeletal functioning and joint development. 

feeding time for Cockapoo
The Cockapoo knows it is feeding time! (Image: Instagram/@shivid_the_cockapoo)

Since Cockapoo puppies range in size even when they’re the same age, it’s also important to feed them a quantity of food tailored to their growth. Your veterinarian can help you determine what and how much food to feed your Cockapoo puppy to help them achieve ultimate growth.

Ensuring your Cockapoo puppy gets exercise is vital, and they’ll need increased amounts of exercise as they get older. But exercising your puppy too long and intensely before their growth plates solidify can cause joint damage and stunted growth.

As a general rule, it’s safe to increase the amount of time you exercise your puppy by five minutes for each month of age. So, a three-month-old Cockapoo puppy can have 15 minutes of exercise per day. It’s best to break up this exercise into two sessions to stimulate them physically and mentally.

Are You Ready To Watch Your Cockapoo Grow?

The Cockapoo full grown size is impossible to determine with certainty until your puppy stops growing. Most of this is because a Poodle’s size varies so much that the gene variation can make it difficult to know just how short or tall a Cockapoo will become.

Nevertheless, I encourage you to read breeder reviews to identify highly accredited people who keep detailed records of their Cockapoo puppies’ lineages. That’s one of the best ways to know how big your Cockapoo will likely grow.