10-to-12-Month-Old Puppy: Nearly an Adult Dog

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

The first birthday is a big milestone. Your puppy is almost an adult in size, but not necessarily in behavior. It is a good time to reflect on how far you have come, to adjust your routines and to look ahead.

Physical development

Most small and medium breeds have reached or are close to adult size by twelve months. Large and giant breeds may continue to fill out and gain muscle for another year or more. Growth plates in the long bones may not close until later in large breeds, so avoid very strenuous or repetitive exercise until your vet says it is safe. See our growth charts.

Mental and emotional development

Adolescence often continues. You may still see boundary testing, selective hearing and bursts of silliness. Many dogs improve noticeably by one and a half to two years, and social maturity often arrives between two and three. Keep your standards steady, and reward the maturity you see.

Training

• Consolidate skills. Proof your cues in more environments.
• Improve reliability. Reduce the use of treats gradually, but keep rewarding good behavior, using a variable schedule.
• Increase duration and distance. For stay, wait and recall.
• Add new activities. Consider dog sports, tricks or advanced classes. See our training guides.
• Keep manners polished. Keep greeting, leash and house manners consistent.

Exercise and mental stimulation

Provide daily walks, play and training. Add new challenges such as hiking, scent work, agility or swimming, adapted to breed and health. Many dogs at this age have boundless energy, and a tired dog is a well-behaved dog. Our guide to nose work for dogs is a good option for any breed.

Feeding and weight

Ask your vet when to switch to adult food. Small breeds may switch around ten to twelve months, while large and giant breeds often stay on large-breed puppy food until fifteen to twenty-four months. Switch gradually over a week or more. Our guide to switching dog food safely explains how. Keep your dog lean, and adjust portions as growth slows.

Health care at one year

At the first-birthday check, your vet may:

• Do a full physical exam and weigh your dog
• Discuss vaccine boosters and parasite prevention
• Check teeth and gums
• Review spay or neuter status
• Discuss joint health, weight and exercise
• Talk about pet insurance and long-term care

See our puppy vet checklist for the first year.

Spay and neuter

If you have not yet decided, now is the time to discuss it with your vet, considering breed, size, health and lifestyle. See spay and neuter pros and cons.

Common issues

• Lingering chewing: Provide chews, and manage the environment.
• Reactivity or fearfulness: Seek help from a qualified trainer or behaviorist if needed.
• Pulling on the leash: Keep practicing, and use appropriate gear.
• Boredom: Increase enrichment and variety.

Celebrate

You have come through the toughest part of dog ownership. Take photos, have a treat and thank your dog for the work it has put in too. Adult life together is just beginning, and the habits you have built will serve you for years.

What a good first-birthday routine looks like

Daily exercise for a one-year-old is usually 45 to 90 minutes for most breeds, split between walks and play, plus training or scent games. Keep two to three short training sessions in your week to maintain skills. Let your dog earn privileges gradually: a longer leash, unsupervised time in a room or off-leash freedom in safe places, only when it shows reliability. If your dog is still crated, extend freedom in small steps, and keep your puppy-proofing alive for a few more months.

The takeaway

Ten to twelve months is the home stretch of puppyhood. Keep training, adjust your care and look forward to many years with your growing companion.