Dogster is reader-supported. When you buy via links on our site, we may earn a commission at no cost to you. Learn more.

Lifestyle

At What Age Is a Dog a Teenager? Vet-Verified Facts & Explanation

Codee Chessher
By Codee Chessher · Reviewed & fact-checked by Dr. Ashley DarbyVet Approved
Dr. Ashley Darby
Reviewed & Fact-Checked byDr. Ashley DarbyBVSc (Veterinarian)
Dr. Ashley has worked in mixed and small animal emergency clinics and general practice ever since 2017 after studying Sydney University. She grew up in South Africa and England before moving to Australia, and her passion for animals came from many childhood safaris in the Kruger National Park.View authorThe information is current and up-to-date in accordance with the latest veterinarian research. Learn more
Updated on June 17, 2026
Share
At What Age Is a Dog a Teenager? Vet-Verified Facts & Explanation

You may have heard that dogs age differently from humans, which is true, but what age does that put their rebellious teenage years? Starting from 6 to 12 months and ending around 18 to 24 months, your dog can be considered an adolescent, or the canine equivalent of being a young teen.

Adolescent dogs can display a lot of the same behavior as teenage humans—emotional outbursts, pushing boundaries, and the early stages of sexual maturity all coincide around the same time thanks to sudden influxes of hormones. Put simply, they are growing up! And just like teenagers, we need to have some understanding of the inner hormonal turmoil your dog is going through when they act out.

Dog development is a fascinating subject for any pet owner, and it is invaluable for letting you know what to expect as your dog grows from a teensy pup to a full-blown adult. Whether you’re interested in how dogs age or just need ways to manage your rowdy adolescent dog, we’ve got you covered. Scroll down as we dig into both of those subjects in more detail.

What Behavioral Changes Should I Expect During Dog Adolescence?

Like human teenagers, adolescent dogs are going through a lot of confusing and overwhelming physical, mental, and emotional changes. They’re more aware of the world and willing to interact, but that comes with some downsides that appear, like bad behavior when your dog can’t always control their first impulse.

Let’s check out some of the biggest behavioral changes you’ll see in your dog as they approach adolescence.

Dog Behavioral Changes During Adolescence:

  • Uncharacteristic defiance: Even well-trained dogs can seem to forget their training and disobey your commands when they hit adolescence. This is normal, and consistent training becomes more important than ever.
  • Destructive impulses: Adolescent dogs need mental stimulation to stave off boredom, or else they’ll resort to natural pastimes like chewing and digging.
  • More energy: Teenage dogs are more physically active and capable of athletic feats than ever, and they’ll need plenty of physical & mental exercise to get out that energy.
  • Reactivity: Even laid-back dogs may see an increase in barking or territorial behavior during adolescence. Use desensitization techniques to temper this. Keep outings calm and pleasant.
Image Credit: PAN Michal, Shutterstock

Fear Periods

Dogs go through fear periods in adolescence and this is a normal part of their development. Fear periods begin suddenly and dogs in a fear period are just, well, fearful of things they wouldn't normally be scared of. They are nothing to worry about; show your dog some gentle love and care and they will get through.

If your dog is going through a fear period try to keep experiences positive as much as possible.

What Are the Life Stages of a Dog?

Dogs have familiar life stages during their shorter lifespans, each with their own unique physical, mental, and emotional changes that slice up a dog’s life. From a new puppy to a graying senior, let’s dig into a bit more about each life stage your dog goes through.

Dog Life Stages:

  • Puppyhood: From birth leading up to 6 months, your dog is a puppy, initially 100% dependent on their mother for survival with gradual physical and cognitive development milestones week by week.
  • Adolescence: Anywhere from 6 to 24 months, your puppy is growing up and learning how to be a fully functional and independent dog, grappling with impulse control, sexual urges, and their newfound ability to do stuff.
  • Adulthood: At around 18 months or so, your dog is fully grown and considered a mature dog. By now, they’ve outgrown most of their defiant teenage habits and they’re as big as they’ll ever get.
  • Senior: Around 7 to 8 your dog qualifies as a senior dog, which may require some diet and exercise accommodations, depending on their breed and health.
Image Credit: Rabinger Photography, Shutterstock

How to Manage a Rowdy Adolescent Dog

Puppy blues has nothing on teenage dog blues! If you’re at your wit’s end dealing with your dog’s new teenage attitude, don’t give up! Most dogs have the same troublesome phase, and it can seem like all your training’s gone out of the window.

On the contrary, sticking to a routine and training will be your life raft in this adolescent storm.

Tips for Managing Your Rebellious Teenage Dog:

  • Crate Training: If you haven’t already, we highly recommend crate training for adolescent dogs. It helps to enforce naps and give them a cozy safe space to call their own, ultimately making for a calmer dog.
  • Obedience Training: Training a teenage dog seems hopeless, but trust us, it’s not. Stick with positive reinforcement and a regular schedule to support your pup while they’re growing up.
  • Socialization: While the most critical window is past, continuing to socialize your dog with supervision helps them continue to learn and practice appropriate behavior around other dogs. Socialization is a skill that needs to be reinforced throughout a dog’s life and not just for a few weeks as a puppy.
  • Exercise: Depending on their breed, most adolescent dogs need at least an hour or so of physical exercise. Supplement them with puzzle toys indoors during their downtime for mental enrichment and to discourage destructive behaviors.

Summary

Dogs are teenagers starting at around 6 to 12 months old and ending around 18 to 24 months.. They can be a handful to deal with between the chewing and defiance, but maintaining a rock-solid routine and providing plenty of physical and mental exercise are the best ways to deal with the chaos.

This is a normal part of growing up and will come to a natural end as they mature into adults.

Sources

Featured Image Credit: Nikaletto, Shutterstock

Want content like this delivered to you?

News, insights, expert advice, and everything dog

Codee Chessher
Authored by

Codee Chessher

Why Dogs Love Cheese - And How to Pay the Cheese Tax Safely

Why Dogs Love Cheese - And How to Pay the Cheese Tax Safely

Ever notice your dog’s tail wagging uncontrollably when you pull out a block of cheese? You’re not imagining it; most dogs genuinely love cheese. But what make…

Dan Seymour
By Dan Seymour · 7 months ago
The Hidden Health Risks Every Maltipoo Owner Should Know

The Hidden Health Risks Every Maltipoo Owner Should Know

Maltipoos are known for their big hearts, fluffy coats, and long lifespans, often reaching 12 to 15 happy years. But even adorable Maltese–Poodle mixes have a…

Dan Seymour
By Dan Seymour · 7 months ago
Vets Say This Common Dog Mistake Could Hurt Their Health - Why You Should Brush Your Dog’s Teeth Today

Vets Say This Common Dog Mistake Could Hurt Their Health - Why You Should Brush Your Dog’s Teeth Today

Let’s be honest—most dog parents mean to brush their pup’s teeth, but life gets in the way. Then suddenly your dog is 5 years old, and you wonder… is it too la…

Dan Seymour
By Dan Seymour · 7 months ago
Gut Check: The Surprising Link Between the Microbiome and Dog Health

Gut Check: The Surprising Link Between the Microbiome and Dog Health

If you’ve ever heard the phrase “health begins in the gut,” you might be surprised to learn it applies to dogs just as much as it does to humans. Emerging rese…

Nicole Cosgrove
By Nicole Cosgrove · 7 months ago
Why I Created Chi Dog: Whole Food Nutrition That Supports Dogs From the Inside Out
June 16, 2026

After more than 15 years practicing as an integrative veterinarian, I saw the same pattern over and over again. Dogs were struggling with skin allergies, chron…

Dr. Susan Bohrer DVM, CVA
By Dr. Susan Bohrer DVM, CVA
Better Than Kibble and Just as Easy to Feed
June 15, 2026

There is a reason kibble is such a popular choice for dog food. This diet option is incredibly easy to purchase, store, and feed. Unlike many fresh and raw foo…

Sara Seitz
By Sara Seitz
The Organization Helping Pets Feel Safer, Happier, and ‘Fear Free’ - Heroes of the Pet World
June 12, 2026

For many pet owners, stress during veterinary visits, grooming appointments, travel, or even routine handling can feel like an unavoidable part of life with an…

Nicole Cosgrove
By Nicole Cosgrove
Why Some Dogs Treat Mealtime Like Playtime - And When to Pay Attention
June 10, 2026

Most dogs are reliable eaters. Bowl goes down, food disappears. So when a dog starts batting kibble across the kitchen floor, tossing pieces in the air, or nos…

Dan Seymour
By Dan Seymour

Love Dogs? So Do We! Join the Dogster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.

You may opt-out at any time. View our Privacy Policy for more information.

The Dogster app on a phone