When Do Puppies Stop Growing?
Updated October 2026
Most puppies stop growing between 9 and 24 months, depending on size. Toy breeds usually finish around 9 months, small breeds around 11 months, medium breeds around 14 months, large breeds around 18 months, and giant breeds around 24 months. If you know your puppy’s expected adult size, you can predict the timeline within a couple of months.
Estimate your puppy's adult weight
Typical maturity by size
Growth does not stop all at once. Height usually finishes first, then the body fills out with muscle over several more months. The table below shows the typical pattern our calculator uses — individual puppies vary, but most land within a month or two of these guides.
| Adult size | Typical adult weight | Usually mature by |
|---|---|---|
| Toy | 2–12 lb | About 9 months |
| Small | 12–25 lb | About 11 months |
| Medium | 25–50 lb | About 14 months |
| Large | 50–90 lb | About 18 months |
| Giant | 90–200 lb | About 24 months |
Why small breeds finish first
Small dogs have less skeleton to build, so they complete the job sooner. A Chihuahua may be fully grown before a Great Dane puppy has finished its fastest growth phase. This is normal biology, not a sign that one puppy is ahead or behind.
Neutering and spaying can slightly extend the growth window, because sex hormones signal growth plates to close. If your puppy was altered early, expect the timeline to stretch by a few weeks. Discuss timing with your veterinarian.
Signs your puppy is done growing
The clearest sign is a flat weight curve: three or four weekly weigh-ins with almost no change. Other clues include the chest broadening rather than the legs lengthening, and the puppy’s proportions looking balanced instead of leggy.
- Weight stays stable across 3–4 weekly weigh-ins
- Legs stop looking disproportionately long
- Chest and shoulders broaden instead of height increasing
- Adult coat fully replaces puppy fluff
What to do when growth finishes
When the scale stops moving, it is time to transition from puppy food to adult food — usually over 7–10 days, guided by your vet. Keep weighing monthly for a few more months: weight gain after growth ends usually means body condition change, not growth, and portions may need adjusting.
Frequently asked questions
Do puppies keep growing after 1 year?
Many do. Medium, large, and giant breeds commonly keep growing well past 12 months — large breeds until about 18 months and giant breeds until about 24 months. Only toy and small breeds are usually finished by one year.
At what age is a puppy fully grown height-wise?
Height typically finishes a few months before weight. A large-breed puppy may reach full height around 12–14 months but keep filling out with muscle until 18 months.
Does neutering affect when a puppy stops growing?
It can delay growth-plate closure slightly, extending the growth window by weeks. The effect is modest for most pet puppies. Discuss timing with your veterinarian, who can weigh it against other health factors.
My puppy stopped gaining weight at 8 months — is something wrong?
Not necessarily. Growth naturally slows and pauses, especially in smaller breeds. What matters is the overall trend and your puppy’s energy, appetite, and body condition. A sudden drop or a complete stall in a young large-breed puppy deserves a vet check.