You usually feed puppy food until your dog is close to physical maturity, which depends mainly on their adult size and breed.

Quick Scoop

  • Most puppies should stay on puppy food for at least 12 months.
  • Small breeds may switch a bit earlier; large and giant breeds often need puppy (or puppy-appropriate) food much longer.
  • The safest rule: keep puppy food until your vet confirms your dog is ~80% of expected adult size and growth has clearly slowed.

General timelines by size

These are typical ranges; your vet’s guidance and your dog’s body condition always come first.

  • Toy & small breeds (up to ~10–12 kg / under ~25 lb adult weight):
    • Reach maturity roughly between 10–12 months.
* Many can switch to adult food around their **1st birthday** if they’re done with their growth spurt.
  • Medium breeds (~10–23 kg / 25–50 lb adult weight):
    • Often mature between 12–15 months.
* Common switch time: **12–15 months** , once they’re near adult height and weight.
  • Large & giant breeds (over ~23 kg / 50 lb adult weight):
    • Grow more slowly and may not fully mature until 15–24 months.
* They usually need **large‑breed puppy or “growth” formulas** for longer to support bones and joints without overloading calories.

* Many stay on puppy/large-breed growth food until **18–24 months** , depending on your vet’s advice.

Signs your puppy is ready to switch

Use these as a guide together with age and breed.

  • Growth has slowed down : no big jumps on the scale between monthly weigh‑ins.
  • Body looks lean and athletic , not pot‑bellied or bony.
  • Teeth are adult teeth (usually by 6–7 months), and chewing kibble is easy.
  • Your vet says your pup is around 80% of expected adult size and can transition.

If you’re unsure, it’s safer to stay on puppy food a bit longer than to switch too early, especially for large breeds.

How to transition from puppy to adult food

Once you and your vet decide it’s time, change food gradually over about a week to protect your puppy’s stomach.

A common 7–10 day plan:

  • Days 1–2: 75% puppy food / 25% adult food.
  • Days 3–4: 50% puppy / 50% adult.
  • Days 5–7: 25% puppy / 75% adult.
  • Days 8–10: 100% adult food.

Watch for:

  • Soft stool or diarrhea
  • Vomiting, itchiness, or obvious discomfort
  • Big changes in energy level or appetite

If anything looks off, slow the transition and call your vet.

Mini “real life” example

You have a medium‑size mixed‑breed puppy expected to be ~20 kg (about 45 lb) as an adult.
At 13 months, your vet notes growth has essentially stopped and your dog is ~90% of expected adult size. You start a 7–10 day gradual mix of adult food into the puppy food, monitoring stools and energy. By day 10, your dog is happily eating adult food only and maintaining a lean, healthy shape.

Quick FAQ

  • What if I switch too early?
    Your pup might miss out on concentrated calories, protein, and minerals needed for growth, or risk bone issues in large breeds if the formula isn’t right.
  • What if I keep puppy food too long?
    Once growth slows, the extra calories can contribute to excess weight , which is tough on joints and long‑term health.
  • Is “all life stages” food okay?
    Some “all life stages” foods are formulated to meet puppy needs as well; your vet can confirm if a specific product is appropriate.

Important note

Because every puppy’s growth curve is a bit different, the best answer for your dog will come from a quick check‑in with your veterinarian with your pup’s current age, weight, and expected adult size.

Information gathered from public forums or data available on the internet and portrayed here.