Puppy Stages and What To Expect While They Grow

Ah, puppies. Who doesn’t love them? They’re cute, cuddly, and full of mischief. But as every dog lover knows, puppies grow up fast. And, with each stage of development, there’s a lot to learn.

Don’t worry, we’ve got your back! In this comprehensive guide, we’ll walk you through all the puppy stages and what to expect as your furball grows.

So, grab a cup of coffee (or doggy treat, if you’re feeling adventurous) and let’s dive in!


Raising a puppy is a lot like raising a child, just with fur and four legs. As they grow, they’ll go through various stages, each with its unique challenges and joys.


Understanding these stages will help you provide the best care for your pup and ensure they grow into a happy, healthy adult dog.

What Are The Puppy Development Stages?

Puppies go through five key developmental stages:

  1. Neonatal (0-2 weeks): At this stage, puppies are completely dependent on their mother for everything. They can’t see, hear, or walk. Touch and taste are their main senses.
  2. Transitional (2-4 weeks): During this period, puppies’ eyes and ears open, they start to walk, and their baby teeth begin to emerge. They’ll also start to explore their environment, albeit clumsily.
  3. Socialization (4-12 weeks): This crucial stage is when puppies learn to interact with other dogs, humans, and their environment. It’s important to expose them to new experiences and people to ensure they grow up to be well-adjusted adults.
  4. Juvenile (12 weeks-6 months): Puppies are now capable of learning basic commands and can be enrolled in obedience classes. They’ll also go through a “fear period” and may be spooked by new things.
  5. Adolescence (6 months-2 years): Like teenagers, adolescent dogs may push boundaries and test your patience. They’ll also experience growth spurts and may become more sexually mature.

Let’s dive deeper into each of the puppy development stages, exploring the physical, behavioral, and emotional changes your pup goes through during each phase.

1. Neonatal (0-2 weeks)

  • Physical changes: Puppies are born blind, deaf, and toothless. They rely on their mother’s warmth and care, as they can’t regulate their own body temperature.
  • Behavioral changes: Neonatal puppies spend most of their time eating and sleeping. They use their sense of touch to find their mother and siblings, and communicate through soft whines and grunts.
  • Emotional changes: At this stage, puppies are entirely dependent on their mother and littermates for security and comfort. Their brains are still developing, and they have limited emotional experiences.

2. Transitional (2-4 weeks)

  • Physical changes: Puppies’ eyes begin to open at around 10-14 days, and their ears open shortly after. They start to walk, albeit wobbly, and their baby teeth begin to emerge.
  • Behavioral changes: As their senses develop, puppies become more aware of their surroundings. They start to explore their environment and interact with their littermates through play.
  • Emotional changes: Puppies begin to form bonds with their littermates and mother. They also start to experience basic emotions like fear, joy, and curiosity.

3. Socialization (4-12 weeks)

  • Physical changes: Puppies continue to grow rapidly during this stage, and their senses become fully developed.
  • Behavioral changes: This is a critical period for learning and socialization. Puppies need to be exposed to a variety of people, animals, and environments to develop confidence and prevent future behavioral issues. They also begin to learn basic manners, such as not biting too hard during play.
  • Emotional changes: Puppies become more emotionally complex during this stage. They experience a wider range of emotions, including attachment to their human family, and may show signs of separation anxiety if left alone.

4. Juvenile (12 weeks-6 months)

  • Physical changes: Puppies continue to grow and develop during this stage, with their adult teeth replacing their baby teeth.
  • Behavioral changes: Juvenile puppies are capable of learning basic commands, making it an ideal time to start obedience training. They may also go through a fear period where they’re more sensitive to new experiences and stimuli.
  • Emotional changes: Puppies’ emotions continue to evolve, and they may become more independent and confident as they learn new skills. However, they may also become more stubborn and willful, so consistent training and boundaries are essential.

5. Adolescence (6 months-2 years)

  • Physical changes: Growth rates slow down, and puppies eventually reach their adult size. Depending on the breed, sexual maturity may also occur during this stage.
  • Behavioral changes: Adolescent dogs often test boundaries and may become more challenging to handle. Consistent training and socialization remain crucial during this time, as does providing ample physical and mental stimulation.
  • Emotional changes: Like human teenagers, adolescent dogs experience mood swings and fluctuating emotions. They may seek more independence while still needing guidance and reassurance from their human family.

Understanding these developmental stages and their accompanying changes will help you better support your puppy’s growth and ensure they have a happy, well-adjusted life.

What Are Fear Periods?

Fear periods are temporary phases when puppies become more sensitive to new experiences and may be easily scared. They typically occur during the juvenile stage, but can also happen in adolescence.

It’s important to expose your pup to new experiences gently during this time and be patient with their reactions.

When Should You Spay Or Neuter Your Puppy?

The decision to spay or neuter your puppy is a personal one, but most vets recommend doing so between the ages of 4-6 months. This can help prevent unwanted litters, reduce aggressive behavior, and even lower the risk of certain health problems.

When Does Puppy Teething Start?

Teething begins around 3-4 weeks of age when puppies’ baby teeth start to emerge. By 6-8 weeks, all their baby teeth should be in place. At around 4-6 months, puppies will begin to lose their baby teeth and adult teeth will start to grow in. This process is usually complete by 7-8 months of age.

Pro tip: Offer your teething pup plenty of chew toys to help alleviate their discomfort and protect your furniture from those sharp little chompers!

When Will Your Puppy Calm Down?

Ah, the million-dollar question: when will your little bundle of energy finally mellow out? The answer depends on the breed and individual dog. Generally speaking, most puppies start to calm down between 1-2 years of age.

However, some high-energy breeds may take a bit longer, while others may be more laid-back from the get-go.

To help your puppy burn off some of that excess energy, be sure to:

  • Provide regular exercise and mental stimulation
  • Enroll them in obedience classes or dog sports
  • Establish a consistent daily routine
  • Offer plenty of chew toys and puzzle toys

When Will Your Puppy Be Fully Grown?

Puppies grow at different rates, depending on their breed and size. Here’s a rough guide to when you can expect your puppy to reach their adult size:

  • Small breeds (e.g., Chihuahuas, Pugs): 9-12 months
  • Medium breeds (e.g., Cocker Spaniels, Border Collies): 12-16 months
  • Large breeds (e.g., Labrador Retrievers, German Shepherds): 18-24 months
  • Giant breeds (e.g., Great Danes, St. Bernards): Up to 36 months

Keep in mind that these are just general guidelines, and your pup may reach their full size earlier or later than these estimates.

Key Takeaways

  • Puppies go through five developmental stages, from neonatal to adolescence.
  • Fear periods are temporary phases when puppies may be easily scared; be patient and gentle during these times.
  • Spaying or neutering your pup is usually recommended between 4-6 months of age.
  • Puppy teething begins around 3-4 weeks and is usually complete by 7-8 months.
  • Most puppies start to calm down between 1-2 years of age, but it can vary by breed and individual dog.
  • Puppies reach their adult size at different times, depending on their breed and size.


And there you have it—a complete guide to all the puppy stages and what to expect as your fur baby grows. Remember, every dog is unique, so be patient and enjoy the journey.

After all, these precious moments with your puppy are fleeting, and they’ll be a full-grown doggo before you know it!

Are you ready to take on the adventure of raising a puppy? With this guide in hand, you’ll be well-equipped to navigate the ups and downs of puppyhood and provide the best care for your new best friend.

Here’s to many happy years together!

Dennis & Becca
Authored by Dennis & Becca

Dennis and Becca, have always shared a passion for man’s best friend. As dog enthusiasts, they put together articles that inform, engage, and captivate fellow dog lovers.

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