Puppy, Adult or Senior? How to Choose the Right Age to Adopt

The right age to adopt depends less on what's cutest and more on your time, energy and household. Puppies and kittens need training and supervision. Adult pets come with a personality you can see. Seniors are often the calmest companions of all.

Here's how the life stages compare, so you can choose the one that fits your life.

Key Takeaways

• Puppies and kittens need the most time: training, socializing and supervision
• Adult pets show you their personality up front, and many are already house-trained
• Senior pets are often calm and easy to live with, but may need more vet care
• Match the pet's energy to your schedule, not just their age
• Ask the shelter about each pet's history, since individuals vary at every age

What Counts as Young, Adult and Senior?

Veterinary guidelines define life stages a little differently for dogs and cats.

• Dogs: puppyhood lasts until rapid growth stops, around 6 to 9 months depending on breed and size. Most dogs are physically and socially mature by 3 to 4 years. A dog is a senior in roughly the last quarter of its expected lifespan, which depends on breed and size.
• Cats: kitten up to 1 year, young adult from 1 to 6 years, mature adult from 7 to 10 years and senior from 10 years on.

How the Life Stages Compare

Adopting a Puppy or Kitten

Young pets are fun, curious and full of energy, and you get to shape their habits from the start. They're also a big time commitment. Expect house training, chewing or scratching, socializing and lots of supervision, plus the full vaccine series if the shelter hasn't finished it. See our vaccination schedule guide.

If you work long days, a puppy can be a tough fit. Read how to adopt a rescue pet when you work full-time.

Adopting an Adult Pet

With an adult pet, what you see is largely what you get: their size, energy level and personality are already clear. Many adult rescue pets already know basic manners and settle in quickly. For many people, especially first-time adopters, an adult is the easiest match. Learn more about why adopting an adult dog might be your best decision.

Adopting a Senior Pet

Senior pets are often calm, affectionate and content with a quieter routine. They can be wonderful companions for people who want a relaxed pet or have less time for training. Plan for more frequent checkups: veterinary guidelines recommend seeing senior cats at least every six months, for example. Our guide to senior pet adoption covers what to expect, and our lifetime care guide explains how needs change with age.

Questions to Help You Decide

• How much time do you have each day for walks, play and training?
• Do you have young children or other pets? A calm adult with a known history around kids and animals is often the safest bet. See adopting with kids.
• What's your budget for vet care? Young pets need their initial vaccines and spay or neuter surgery, and seniors may need more frequent care. Our cost of adopting and owning a dog guide can help you plan.
• How long a commitment are you ready for? A puppy or kitten may be with you for well over a decade.

Whatever age you're leaning toward, ask the shelter or rescue about the individual pet. Energy and temperament vary at every age. For more questions to work through, see the 10 questions to ask before adopting.

Frequently Asked Questions

Is it better to adopt a puppy or an adult dog?

It depends on your time and experience. Puppies need training and supervision, while adult dogs have known personalities and are often already house-trained, which makes them a good fit for many households.

At what age is a dog considered a senior?

In roughly the last quarter of their expected lifespan, which depends on the dog's breed and size.

At what age is a cat considered a senior?

Veterinary guidelines define senior cats as 10 years and older.

Are senior pets a good choice for first-time adopters?

Often, yes. Many seniors are calm and settled, but plan for more frequent vet visits and ask the shelter about any health needs.

Find the Right Match

Every age has something special to offer. Search adoptable pets near you on WeRescue to find yours.

Find Your Perfect Pet Match

Sources: 2019 AAHA Canine Life Stage Guidelines, 2021 AAHA/AAFP Feline Life Stage Guidelines

• Senior Pet Adoption: Why Older Dogs & Cats Make Perfect Companions
• Why Adopting an Adult Dog Might Be the Best Decision You Ever Make
• Adopting with Kids: The Complete Family Guide to Choosing the Right Pet
• The 10 Questions You Must Ask Before Adopting a Dog or Cat
• Complete Lifetime Pet Care Guide: Shelter to Senior Years