Diamond Naturals Large Breed Puppy Formula Dry Dog Food, 40-lb bag

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At a Glance

  • No Corn No Wheat No Soy
  • Immune Support
  • Digestive Health
  • Skin & Coat Health
  • Made in USA
  • Puppy
  • Large Breeds
  • Giant Breeds

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About This Item

Details

  • Made in the USA by a family-owned company using quality ingredients from trusted domestic and global sources.
  • With real pasture-raised lamb as the #1 ingredient, this recipe is formulated with carefully determined protein and mineral content to support the needs of large breed puppies.
  • Crafted with balanced nutrient levels to fuel larger growing bodies, contains omega fatty acids for skin and coat health and features vitamins and minerals from superfood fruits like blueberries and oranges.
  • Each serving includes species-specific K9 strain proprietary probiotics, plus antioxidants and prebiotics to help support healthy digestion, immune system health and overall wellness.
  • Made without corn, wheat, artificial flavors or colors.

Ingredient Information

Feeding Instructions

About Diamond Pet Food

Headquartered in Missouri, family-owned Diamond Pet Food believes that every pet deserves the best food possible, and they've been delivering on that promise since 1970. They use state-of-the-art facilities across the USA to create quality cat and dog food made to the highest nutritional standards. Every formula balances protein, fat and essential nutrients to keep your pets active and healthy and performing their best.

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Questions & Answers

36 Customer Questions

Are the manufacturing facilities in the USA?

Answer by Chewy • Feb 28, 2018
All Diamond formulas are manufactured under rigorous production standards in Diamond’s state-of-the-art U.S. facilities.

Are all ingredients used to make this food from the usa? And if not where are they from?

Answer by Chewy • Feb 27, 2018
This formula uses some ingredients that are not USA sourced, like flaxseed and barley, both which originate in Canada and lamb and lamb meal from New Zealand and Australia, potato protein from Germany and dried chicory root from Belgium. There are ingredients such as folic acid and taurine that can only be sourced out of China.

How many cup is in the 6lb bag?

Answer by Chewy • Apr 14, 2018
There will be approximately 4 cups per pound of kibble. The 6 pound bag will have close to 24 cups, the 20 pound bag close to 80 cups and the 40 pound bag close to 160 cups.

why the does your food have Papaya in it.

Answer by Chewy • Jul 04, 2018
Papaya and papaya enzymes are healthy ingredients to add to dog food. Papaya adds sweetness as well as vitamins and fiber to a dog's meal.
Reviews
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4.3
Rated 4.3 out of 5 stars
2787 Ratings
Terms & Conditions

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Digestibility

76% Positive

Ingredients

82% Positive

Nutritional Value

80% Positive

Palatability

79% Positive

1446 Customer Reviews

Rated 4 out of 5 stars
By Erin on Jan 11, 2026

Online Reviews

I adopted my puppy from a breed specific rescue and this was the food he was on. I’d never heard of it before. I did online research and the Naturals line formulas

I adopted my puppy from a breed specific rescue and this was the food he was on. I’d never heard of it before. I did online research and the Naturals line formulas comes well recommended and ranks better than the lines that aren’t Naturals. So I bought this bag. No GI distress. I’ll see how it goes as he grows up. It’s much less than the Blue Buffalo Wilderness lines which is nice. But it really is about quality of diet. That’s what I’d had used for many years.

Rated 1 out of 5 stars
By Ashrae on Jan 19, 2026

Food made my dog extremely ill

I slowly transitioned my puppy to this food & he became extremely ill, to the point of needing veterinary attention. The manufacturer didn’t offer a refund unless

I slowly transitioned my puppy to this food & he became extremely ill, to the point of needing veterinary attention. The manufacturer didn’t offer a refund unless I purchased trash bags or zip locks to put it all in & ship it back, a major inconvenience considering I have to pay for vet bills caused by their food. Do NOT recommend. The price isn’t worth it.

Rated 1 out of 5 stars
By Deborah on Dec 24, 2025

Puppy Developed Diarrhea After Eating This Food

We have a 5-month-old puppy who developed diarrhea after eating this food. The symptoms started shortly after he began eating it, and it took about 48 hours after

We have a 5-month-old puppy who developed diarrhea after eating this food. The symptoms started shortly after he began eating it, and it took about 48 hours after stopping the food for his stool to return to normal. As soon as we switched to a different food, he improved. Based on our experience, something may be wrong with this product, and the company should look into it, especially since puppies have sensitive digestive systems.

Rated 5 out of 5 stars
By Amber on Nov 30, 2025

Whole ingredients & More calories

As a vet tech, I’ve gotten to know dog food and their pros and cons a little bit better over the years. I’ve taken aAs a vet tech, I’ve gotten to know dog food and

As a vet tech, I’ve gotten to know dog food and their pros and cons a little bit better over the years. I’ve taken aAs a vet tech, I’ve gotten to know dog food and they’re pros and cons a little bit better over the years. I’ve taken a special interest in nutrition especially since finding out my GSP had a food allergy to chicken. After doing some research and having him on diamond naturals adult for a while, I decided to make the switch to puppy because it had whole lamb as the first ingredient and more calories per cup, which means I can feed him better ingredients and also make the bag last longer. I have never had issues with diamond naturals and actually chose to switch to diamond from Puro on after having multiple issues with the Purina brand.

Rated 2 out of 5 stars
By Christopher on Nov 12, 2025

Soft stool ever since switching

We brought our rescue pup home this summer and transitioned him over the course of a month from the shelter food to diamond large puppy after finding a week and

We brought our rescue pup home this summer and transitioned him over the course of a month from the shelter food to diamond large puppy after finding a week and a half was too quick for him and was giving him an upset stomach. Because we’re still getting used to his habits and he ate it happily we finished the first bag out. His vet said it could just take time for him to settle in, or it could be the formula, but suggested sticking with this food and giving him pumpkin a couple times a week. We just got a new bag and his stomach is even worse with it, so we’ll need to either return it or give it to a shelter. Our other dog is on diamond adult small breed and does great with it, but this food seems to be problematic for our big guy. I’ve had him tested for parasites and all labs done, they’ve come back completely clean each time. Wish it would have worked out for him.

Rated 5 out of 5 stars
By Lisa on Jan 2, 2026

Finally!! For Great Pyrenees puppy

It has not been an easy task to find a large breed puppy food that agrees with our great pyrenees pup but this is the real deal and includes healthy grain as well

It has not been an easy task to find a large breed puppy food that agrees with our great pyrenees pup but this is the real deal and includes healthy grain as well. We couldn’t be happier and Nellie Jane loves it too

Rated 5 out of 5 stars
By Monique on Dec 30, 2025

We have always started our pups on this and transitioned to the adult version.

Love this. We have dogs with skin sensitivities to beef so this has been a great food for us. Our senior dog is on the adult version of this food. He and his

Love this. We have dogs with skin sensitivities to beef so this has been a great food for us. Our senior dog is on the adult version of this food. He and his sister started off on this exact puppy food and did great. The dogs love this so much we can use the feed as dog treats!

Rated 5 out of 5 stars
By Brian on Jan 6, 2026

Consistently good

This was suggested by the breeder of our Bernese Mountain Dog which notoriously have digestive issues and she very rarely has any issues on this food and certainly

This was suggested by the breeder of our Bernese Mountain Dog which notoriously have digestive issues and she very rarely has any issues on this food and certainly because she got into something else

Rated 1 out of 5 stars
By Milicent on Jan 3, 2026

ingredients

I could not read everything in the ingredients and thought this was chicken free, but it is not. They use Chicken fat as a by product. I needed chicken free because

I could not read everything in the ingredients and thought this was chicken free, but it is not. They use Chicken fat as a by product. I needed chicken free because of my puppy has allergies

Rated 4 out of 5 stars
By Norm on Jan 20, 2026

Product good, opening bad sucks

Our pup loves the food but the opening the bag sucks. There’s really no good way to open it and have it easily resealed. Diamond needs to improve the bag.

Our pup loves the food but the opening the bag sucks. There’s really no good way to open it and have it easily resealed. Diamond needs to improve the bag.