When to switch puppy to adult food depends mostly on your dog’s expected adult size. Toy and small breeds can usually switch between 8 and 12 months, medium breeds around 12 months, large breeds around 12 to 15 months, and giant breeds between 18 and 24 months. Make the change gradually over about a week.
Quick takeaways
- Smaller dogs finish growing sooner, so they switch to adult food earlier.
- Large and giant breeds should stay on a large-breed puppy food longer.
- Spaying or neutering lowers calorie needs, so ask your vet about portions or timing.
- Switch gradually over 7 to 14 days to avoid an upset stomach.
- When in doubt, staying on puppy food a little longer is the safer mistake.
In this guide
- Why do puppies need puppy food in the first place?
- What age should puppies switch to adult food?
- When should popular breeds switch to adult food?
- How do you switch a puppy to adult food?
- How do I choose the right adult food?
- What happens if you switch to adult food too early or too late?
- How do I know my dog is at a healthy weight after the switch?
- Frequently asked questions
Your puppy has been eating puppy food since they came home, and now they’re starting to look a lot more like a grown dog. So when do you change foods? The right time depends on how big your dog will be as an adult, along with a few other details your vet can help with.
Why do puppies need puppy food in the first place?
Growing puppies need more calories, protein and certain minerals than adult dogs. Food made for growth is formulated to meet those needs. Look for a nutritional adequacy statement on the bag that says the food is complete and balanced for growth or for all life stages. If it’s labeled for “adult maintenance” only, it isn’t designed for a growing puppy.
For large and giant breeds, the details matter even more. These puppies grow for a long time, and too many calories or the wrong calcium balance can raise the risk of bone and joint problems. A food labeled for growth of large-size dogs (70 pounds or more as an adult) is designed with that in mind.
What age should puppies switch to adult food?
Puppies are ready for adult food when they’re close to their adult size. PetMD suggests switching around the time a puppy reaches about 80% of expected adult size. The American Kennel Club offers this general guide based on breed size in its article on transitioning from puppy to adult food:
| Adult size | Typical time to switch |
|---|---|
| Toy and small breeds | 8 to 12 months |
| Medium breeds | Around 12 months |
| Large breeds | Around 12 to 15 months |
| Giant breeds | 18 to 24 months |
Very active puppies may do better staying on puppy food a bit longer. The AKC’s puppy feeding guide puts it simply: it’s better to be on puppy food a little too long than not long enough.
Does spaying or neutering change the timing?
It can. Spaying or neutering lowers a puppy’s calorie needs. PetMD notes that if this happens before a puppy is close to adult size, calorie needs can drop noticeably. That doesn’t automatically mean switching early, but it does mean watching portions so your puppy doesn’t gain extra weight. Ask your vet whether to adjust amounts or timing after surgery.
When should popular breeds switch to adult food?
Breed guides give useful starting points, but your own puppy’s growth and body condition matter more than the calendar. Always check with your vet.
Golden Retriever and Labrador Retriever. Both are large breeds. Many vets keep them on a large-breed puppy food until somewhere around 12 to 15 months, then switch to an adult food. Because Labs tend to love food and can gain weight easily, keeping them lean during the switch is important.
German Shepherd. German Shepherds are large dogs that keep maturing well into their second year. A large-breed puppy food until about 12 to 15 months or a bit later is common. Your vet may suggest a different time depending on your puppy’s growth.
Corgi. Pembroke and Cardigan Welsh Corgis are smaller dogs on long bodies. Many are ready for adult food around 12 months. Corgis can put on weight easily, so ask your vet about portions after the switch.
Mixed breeds. If you don’t know how big your puppy will get, your vet can estimate based on current weight and growth. Our puppy feeding schedule also covers how meals change as puppies grow.
How do you switch a puppy to adult food?
Change foods gradually. VCA Animal Hospitals’ guide on when to switch puppy to adult food recommends making the change over 7 to 14 days, starting around 90% puppy food and 10% adult food and adding about 10% more adult food each day. Here’s a simpler one-week version along the lines of the AKC’s guide to switching dog foods:
| Days | Old puppy food | New adult food |
|---|---|---|
| Days 1 and 2 | 75% | 25% |
| Days 3 and 4 | 50% | 50% |
| Days 5 and 6 | 25% | 75% |
| Day 7 | 0% | 100% |
A few tips help the change go smoothly:
- Keep the total amount of food the same while mixing, then adjust portions using the adult food’s feeding guide and your vet’s advice.
- Stick to your usual meal times.
- Watch stool, appetite and energy. If your puppy gets loose stool or vomits, slow down.
- If stomach upset doesn’t settle within about 24 hours, call your vet.
Puppies with sensitive stomachs may need an even slower switch. Our guide to puppy food for sensitive stomachs has more ideas.
How do I choose the right adult food?
Look for these basics on the bag:
- A statement that the food is complete and balanced for adult maintenance, based on AAFCO standards
- A brand that employs qualified nutritionists and does quality control testing (you can ask the company)
- A size or activity formula that fits your dog, like large-breed adult for big dogs
Food trends like grain-free diets come up a lot. Before choosing one, read our article on grain-free puppy food and talk with your vet. For a closer look at how the two formulas differ, see puppy vs. adult dog food.
What happens if you switch to adult food too early or too late?
Too early. An adult maintenance food may not supply what a growing puppy needs, especially calories and some minerals. That’s why it’s wise to wait until your puppy is close to full size.
Too late. Staying on puppy food a little past the ideal time isn’t usually a crisis, but puppy food is calorie dense. A dog who’s done growing may start putting on weight. If your puppy is getting chunky, talk with your vet about switching or reducing portions.
How do I know my dog is at a healthy weight after the switch?
Use your hands and eyes. You should be able to feel your dog’s ribs easily under a thin layer of fat, see a waist from above and see a slight tuck in the belly from the side. If you can’t, ask your vet about adjusting portions. Weigh your dog every few weeks for the first couple of months after the switch, and remember that treats count toward daily calories, too.
Frequently asked questions
How do you switch a puppy to adult food?
Mix a small amount of the adult food into the puppy food and increase it a little each day. VCA suggests starting with about 90% puppy food and 10% adult food, then shifting by about 10% a day over 7 to 14 days. Slow down if you see loose stool.
How do I switch my puppy to a new food?
Use the same gradual approach for a new brand or for adult food. Blend the new food with the old food in increasing amounts over about a week or two, keep the total amount the same and watch your puppy’s stool, appetite and energy.
What age should puppies change to adult food?
Most small breeds are ready between 8 and 12 months, medium breeds around 12 months, large breeds around 12 to 15 months and giant breeds between 18 and 24 months. Your vet can help you decide based on your puppy’s growth and body condition.
What age can I switch from puppy food?
Not before your puppy is close to adult size. PetMD suggests switching when a puppy reaches about 80% of expected adult size. For a mixed breed, your vet can estimate adult size and help you pick the right time.
Is it bad to switch puppy food?
Switching foods isn’t bad if you do it slowly and pick a complete and balanced food for your puppy’s life stage. Sudden changes can cause vomiting or diarrhea, and switching to adult food too early can shortchange a growing puppy.
Vet note: This article is general information and is not a substitute for advice from your own veterinarian. If your puppy is having trouble breathing, collapses, has a seizure or may have eaten something toxic, call your vet or the nearest emergency animal hospital right away. ASPCA Animal Poison Control: 888-426-4435 (a fee may apply).
