Dogster is reader-supported. When you buy via links on our site, we may earn a commission at no cost to you. Learn more.

Dog Nutrition

When to Switch a Great Dane From Puppy to Adult Food? Vet Approved Guide

Misty Layne
By Misty Layne · Reviewed & fact-checked by Dr. Maxbetter VizelbergVet Approved
Dr. Maxbetter Vizelberg
Reviewed & Fact-Checked byDr. Maxbetter VizelbergDVM (Veterinarian)
A native of New Orleans, Louisiana, Maxbetter has been cultivating his interest in veterinary medicine since he's been a kid. From being read Russian children’s stories about “Doctor Aybolit” by his grandmother to interning at the Israeli Wildlife Hospital to working at numerous small animal hospitals, he has thoroughly enjoyed learning about and sharing his love for animals with others over the years. He prides himself on educating others to help give their animals the best possible lives and strives to provide the best medical care to his patients. Outside the clinic, he can be found performing his rap songs at open mics, playing soccer and basketball, and going on hikes with family and friends. He currently practices in New York City.View authorThe information is current and up-to-date in accordance with the latest veterinarian research. Learn more
Updated on June 17, 2026
Share
Two great danes on the sofa

Dogs are similar to children in that one moment, they’re a puppy, then you blink, and they’re all grown up. And like children, dogs will have different nutritional needs to be met as they get older. That means it’s smart to know when to switch a dog from a puppy food to adult food.

In the case of larger dog breeds, you’ll find most recommendations say to switch from puppy to adult food at 12 months of age. However, it’s different in the case of the Great Dane. Though this giant breed tends to grow very quickly, it doesn’t actually mature until much later—around 2 years or so1. This means cartilage and bones are still growing, which requires the nutrients puppy food contains.

So, when can you switch a Great Dane from puppy to adult food? Great Danes should be switched at 18 months of age.

divider dog paws 3 oct 2024

How to Switch a Great Dane from Puppy to Adult Food

Now that you know when to switch your Great Dane puppy to adult food, it is time to learn how to switch foods without having it upset your pup’s stomach. You can’t just put down puppy food one day, and then adult food the next; this is a recipe for gastrointestinal issues. Instead, you’ll need to make the food switch slowly, so your Great Dane has an easier time with the transition.

Do not worry that a slow switch will take forever, though. You can easily switch your dog from puppy to adult food in just four days.

Here’s how:

  • Day 1: 75% puppy food, 25% adult food
  • Day 2: 50% puppy food, 50% adult food
  • Day 3: 75% adult food, 25% puppy food
  • Day 4: 100% adult food

That’s it! It takes less than a week to switch your dog’s food out slowly enough. When it comes to the type of adult food you choose, you probably want to continue with the same brand as the puppy food (and even the same flavor if possible). This will also make the transition easier for your pup.

Image Credit: Rick's Photography, Shutterstock

The Dangers of Overfeeding

It can be easy to overfeed a Great Dane, whether they’re a puppy or an adult. However, you need to be very aware of how much you’re feeding your pet, as overfeeding a giant breed dog may not just result in obesity. Too much food for your dog can actually lead to joint diseases, such as osteochondritis or hip and elbow dysplasia as excess food encourages rapid growth, which can negatively impact giant breeds.

To figure out the best amount to feed your Great Dane, check out the bag of dog food for feeding guidelines or speak to a vet about what’s appropriate. Overall, though, Great Danes may generally require 6–10 cups of food a day depending on their current size.

The Dangers of Eating Too Quickly

Many dog breeds tend to gobble down their food, and this habit of eating too quickly isn’t as innocuous as one might think. Eating too fast is just one-way bloat (or gastric dilation volvulus) can occur in dogs, and unfortunately, this is one of the biggest killers of Great Danes. There are ways you can reduce the chances of this occurring, though. First and foremost, use a slow feeder to prevent your pet from eating its food in one gulp. Slow feeders make it harder for your dog to get food out of the bowl, which means it can’t eat nearly as fast as it typically does. These come in a variety of shapes, sizes, and colors, so you shouldn’t have difficulty finding one that works for your Great Dane. Other than eating too quickly, other possible causes of bloat in dogs include:

  • Exercising right after eating
  • Having a single meal a day
  • Stress

So, don’t feed your Great Dane just once a day. Instead, break it down into two or more meals throughout the day, and ensure your pet isn’t going for long runs or engaging in rambunctious play in the backyard for at least an hour after eating. You may also consider a prophylactic procedure (that is frequently done in breeds predisposed to bloat) called gastropexy for your Dane, which involves tacking the stomach to the abdominal wall.

Image Credit: Lucky Business Shutterstock
divider dog paws 3 oct 2024

Conclusion

Great Danes grow quickly but don’t fully mature until later, so they shouldn’t be switched from puppy to adult food until they’ve reached 18 months of age. When switching your dog’s food, you should do a slow transition to avoid any stomach upset (which will still only take 4 days or so). You should also take care to avoid overfeeding your Great Dane to reduce the risk of degenerative joint diseases that can occur from eating too much and growing too quickly.

Finally, ensure your dog isn’t eating too fast, no matter what age it is. Eating quickly can cause bloat, which is one of the biggest killers of the Great Dane. You can give your dog its food in a slow feeder to help it eat at a more normal pace and also help prevent bloat by discouraging exercise after a meal and feeding your Great Dane two or more meals a day.

Sources

Featured Image Credit: Martin Tajmr, Pixabay

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything dog

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

Misty Layne
Authored by

Misty Layne

How Much Food Does a Great Dane Need? With Feeding Chart

How Much Food Does a Great Dane Need? With Feeding Chart

Great Danes are one of the biggest dogs in the world, and it’s no surprise when you meet one face to face. If you decide to add one of these gentle giants to y…

Nicole Cosgrove
By Nicole Cosgrove · 1 week ago
When to Switch to an Adult Dog Food? Vet-Approved Facts & FAQ

When to Switch to an Adult Dog Food? Vet-Approved Facts & FAQ

Enthusiastic, sweet and downright fun—puppies are simply wonderful. All it takes is one look from those adorable puppy eyes to hook most people to the point of…

Lorre Luther
By Lorre Luther · 3 weeks ago
Puppy vs Adult Dog Food: Vet-Verified Differences & When to Switch Diets

Puppy vs Adult Dog Food: Vet-Verified Differences & When to Switch Diets

Whether we realize it or not, as dog owners, we have a significant influence over the health and wellbeing of our dog, with the food we choose playing one of t…

Nicole Cosgrove
By Nicole Cosgrove · 4 days ago
Can a Puppy Eat Adult Dog Food? Vet Approved Facts & FAQ

Can a Puppy Eat Adult Dog Food? Vet Approved Facts & FAQ

Bringing a new puppy home is an exciting experience. Plenty of responsibilities are involved, like ensuring your new pup gets the proper nutrition for a long,…

Rachael Gerkensmeyer
By Rachael Gerkensmeyer · 3 weeks ago
June 17, 2026

Can Adult Dogs Eat Puppy Food? Vet-Approved Facts & FAQ

We all know that there is puppy food and adult dog food. If you are the proud owner of a new puppy, congratulations! But if you already have an adult dog in th…

Kathryn Copeland
By Kathryn Copeland
Can Adult Dogs Eat Puppy Food? Vet-Approved Facts & FAQ
June 27, 2026

Do Puppies Need Puppy Food? Vet-Verified Facts & FAQ

When you stop to really think about it, it may seem like a no-brainer that puppies would need different food from our adult dogs. After all, we feed infants ba…

Chris Dinesen Rogers
By Chris Dinesen Rogers
Do Puppies Need Puppy Food? Vet-Verified Facts & FAQ
June 17, 2026

Is It Bad to Switch Dog Food Often? Vet-Reviewed Facts & FAQ

A mistake that many dog owners make is finding good dog food and sticking to it forever. In fact, that’s the advice that many people give—advice that may have…

Keri-Beth Clur
By Keri-Beth Clur
Is It Bad to Switch Dog Food Often? Vet-Reviewed Facts & FAQ
June 27, 2026

How Much Food to Feed a Lab: Feeding Guide & Nutritional Tips

Wouldn’t you love to feed your Labrador dog the best, high-quality food in the exact quantities it needs to thrive? Every dog owner wants this more than anythi…

Cassidy Sutton
By Cassidy Sutton
How Much Food to Feed a Lab: Feeding Guide & Nutritional Tips
June 27, 2026

How to Feed a Puppy: 10 Vet-Approved Tips

Puppyhood is an important time in a dog’s life that’s marked by significant growth and development. Puppies have many needs and require a great deal of time an…

Jessica Kim
By Jessica Kim
How to Feed a Puppy: 10 Vet-Approved Tips
June 17, 2026

Puppy Feeding Guide: Quantity, Schedule & FAQ

It is essential to feed your puppy correctly. Puppies are constantly growing and need different nutrition than an adult dog. Feeding your puppy correctly now c…

Kristin Hitchcock
By Kristin Hitchcock
Puppy Feeding Guide: Quantity, Schedule & FAQ
June 29, 2026

When Can a Puppy Start Eating Puppy Food? Vet-Approved Recommendations

There's nothing much cuter than a puppy, but with puppies come responsibilities. Knowing how to feed puppies and when to wean them off their mother's milk is i…

Rachel Giordano
By Rachel Giordano
When Can a Puppy Start Eating Puppy Food? Vet-Approved Recommendations
June 17, 2026

When to Switch to Senior Dog Food? 4 Vet-Reviewed Factors to Consider & Other Tips

Unlike puppy and adult food, senior dog food isn’t technically a type of food. The AAFCO does not list specific nutritional standards for senior dogs as they d…

Kristin Hitchcock
By Kristin Hitchcock
When to Switch to Senior Dog Food? 4 Vet-Reviewed Factors to Consider & Other Tips

Love Dogs? So Do We! Join the Dogster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.

You may opt-out at any time. View our Privacy Policy for more information.

The Dogster app on a phone