When should I stop feeling my dog puppy food? Here’s what a vet has to say

Chocolate Labrador puppy sitting in a food bowl
(Image credit: Cmannphoto/Getty Images)

‘When should I stop feeding my dog puppy food?’ This is a question that lots of new pet parents have, but the answer isn’t always so obvious. As your furry friend gets older, you might notice changes in their behavior and energy levels, which might make you think that it’s time to re-assess their diet.

At some point in time, your little one will need to make the switch from the best puppy food to the best dog food. But how do you know they’re ready? Unfortunately, this isn’t a straightforward answer as it depends on their breed.

You might have heard that dogs are mature by the age of one. However, large and giant breeds can actually take between 18 months and two years to reach full development, and small dog breeds can take just nine months. 

Before you start switching your dog’s diet up, you need to wait until they have reached musculoskeletal maturity (when they have stopped growing and the growth plates in their bones have closed). 

If you’re not sure when that is and want to learn how to transition into dog food safely, then you’re in good hands. We’ve rounded up everything you need to know - from when you should change their food, how much you should be feeding them, and everything in between:

Elizabeth Racine
Elizabeth Racine

Dr. Elizabeth Racine is a small animal general practice vet with a bank of knowledge on all things pet health and wellness.  She is especially interested in veterinary behavior, nutrition, and internal medicine. Dr. Racine also has experience writing content for the American Kennel Club, Merck Animal Health, Bayer PetBasics, Elanco, and CareCredit. 

Are there significant differences between puppy food and adult food?

Your puppy should eat a commercial diet that is specifically formulated for puppies.  Growing puppies have different nutritional needs than adult dogs, and puppy food is formulated to meet these needs. Puppy diets tend to be higher in calories to support growth, and have a different balance of vitamins and minerals to provide optimal nutrition for growing bones and muscles. Most vet nutritionists do not recommend homemade, raw, or adult dog food diets for puppies because these diets do not provide the right balance of nutrients to support rapid growth and may lead to developmental abnormalities.  

While feeding puppy food to an adult is less risky than feeding adult food to a puppy, there are still concerns with feeding an adult dog a diet that does not match his current life stage.  Puppy diets are often higher in calories than adult food, in order to support rapid growth. This can lead to rapid weight gain in adults, especially in spayed or neutered dogs.

Brown and white puppy eating out of food bowl

(Image credit: AVAVA/Getty Images)

When should I stop feeding my dog puppy food?

The exact timing of the transition from puppy food to adult food will depend on a few individual factors. Your puppy’s age, breed, expected adult size, and current health status should all be taken into account. In most cases, you should wait until your dog is fully grown before transitioning to an adult diet. Small and medium breed dogs typically finish growing at around eight months to one year of age, while large and giant breeds may not reach their full adult size until 18 months of age.  

If you’re uncertain when your dog will be fully grown, a good rule of thumb is to wait until your dog is one year of age before transitioning to an adult diet.  Some dogs may need to transition even earlier if they have medical problems that can be managed with diet, such as food allergies or digestive problems.  Your vet is a great resource to help you decide the best time to make the transition, and can also recommend adult dog foods to meet your dog’s individual needs.

If your dog has sensitivities, you might want to invest in the best dog food for allergies when making the switch. 

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At what age is a dog considered an adult?

A dog is considered to have reached adulthood once their musculoskeletal growth is complete and the skeletal growth plates have closed. This can occur between eight and 18 months of age, depending on your dog’s breed and size. Small breed dogs tend to reach maturity sooner. Large and giant breed dogs take much longer to finish growing and may not reach adulthood until well over a year of age.

If you’re still not sure, your vet can help you determine whether your dog is likely to be fully grown or not. In some cases, he or she may even take X-rays to determine whether your dog’s growth plates have fully closed, indicating musculoskeletal maturity.

Brown puppy eating from dog bowl

(Image credit: Westend61/Getty Images)

How should I transition my dog to adult food?

Transitioning to a new diet should be done gradually, to prevent digestive upset.  A diet transition should take at least seven days, but may need to be longer if your dog is prone to gastrointestinal issues, like diarrhea.  

To help your dog get used to the new diet, start by mixing a very small amount of the new diet with their old puppy food. Every day, add a little bit more of the new food and a little bit less of your dog’s old food. By mid-week, aim to be feeding a 50:50 mixture of the new and old food. Continue this gradual transition in the following days, with the goal of having your dog fully transitioned to the new adult diet by day seven. 

If at any point your dog develops symptoms of an upset stomach such as diarrhea, loss of appetite, flatulence, or bloating, this is a sign that the diet transition may be happening too quickly.  

Slowing down your transition can usually resolve midl gastrointestinal issues associated with a diet change.  If gastrointestinal symptoms are severe, or if they persist for more than 24-48 hours, contact your vet for further guidance.

How much should I feed my dog?

Just like the answer to the question How much should I feed my puppy will differ from pup to pup, how much you feed your dog at each meal depends on many different factors, such as your dog’s current weight and body condition score, activity level, the calorie content of the diet, and any other food or treats your dog receives during a typical day. Every brand and variety of dog food has a different nutritional content, so it’s impossible to make a blanket recommendation without knowing the caloric content of a diet.  

Most dog food bags have a feeding guide on the back of the bag. This can be a helpful starting point, but isn’t always very detailed. For a more accurate assessment, ask your vet to calculate your dog’s daily calorie requirements. You can then use this number to determine how much to feed, based on the calorie content of your dog’s food.  

Don’t forget to include any treats, supplements, or table scraps in your dog’s daily allotment as well – these can be a significant source of extra calories! Remember that your adult dog is no longer growing and may have a slower metabolism after being spayed or neutered, so he may need fewer calories per day than he did previously.

Brown and white puppy eating food from bowl

(Image credit: Eva Blanco/Getty Images)

How do I know if I’m feeding my puppy enough?

Your puppy should be eating enough to grow and gain weight at a steady, healthy rate. Puppies that grow too quickly or become overweight are more prone to develop orthopedic problems, so you do not want to overfeed your puppy. Ideally, your puppy should maintain a healthy lean body weight.  

To determine whether you are feeding your puppy enough, ask your vet to evaluate your puppy’s Body Condition Score, or learn how to evaluate the Body Condition Score at home. If your puppy’s Body Condition Score is too low, you may need to increase the amount of food you are feeding your puppy. If the Body Condition Score is too high, your puppy is overweight and you will need to decrease the amount of food you are feeding to reach an ideal score.   

Welcome to adulthood!

When should I stop feeding my dog puppy food? When he reaches adulthood. You might miss those adorable puppy antics, but there are tons of new adventures to discover in this phase of your dog’s life. With the right nutrition and a gradual transition to his new diet, your dog will be ready to take on any challenge his new adult life may bring! 

Enjoyed this piece and looking for more great content to help you in the first year of your little one's life? Then be sure to check out our guides to 'how to stop puppy food aggression' and 'Puppy not eating? Try this...

Elizabeth Racine, DVM

Dr. Elizabeth Racine is a small animal general practice vet covering all things pet health and wellness.  Her special interests include veterinary behavior, nutrition, and internal medicine.  As a freelance writer, Dr. Racine has written content for major companies in the industry such as the American Kennel Club, Merck Animal Health, Bayer PetBasics, Elanco, and CareCredit.  In her free time, Dr. Racine enjoys playing trampoline dodgeball, hiking with her beagle Dasher, and spending time with her three mischievous cats.