🐱 NEW!

Introducing the Cat Food Advisor!

Independent, unbiased reviews without influence from pet food companies

Hill’s Science Diet Dog Food Review

Mike Sagman  Julia Ogden

By

Mike Sagman
Mike Sagman

Mike Sagman

Founder

Dr Mike Sagman is the creator of the Dog Food Advisor. He founded the website in 2008, after his unquestioning trust in commercial dog food led to the tragic death of his dog Penny.

Read more
&
Julia Ogden
Julia Ogden

Julia Ogden

Content Director

Julia is the content director at the Dog Food Advisor and responsible for the overall strategy of the website.

Read more

Updated: June 7, 2024

Verified by Laura Ward

Laura Ward

Laura Ward

Pet Nutritionist

Laura studied BSc (Hons) Animal Science with an accreditation in Nutrition at the University of Nottingham, before working for eight years in the pet food and nutrition industry.

Read more

Laura Ward

DogFoodAdvisor is reader supported See how


All reviews are 100% impartial but if you buy using links on this page, we may earn a referral fee.

Is Hill's Science Diet a good dog food?

In this review… The Dog Food Advisor takes an in-depth look at Hill’s Science Diet and rates each of its 6 most important sub-brands.

And we’ll also reveal:

  1. Is Hill’s Science Diet made in the United States?
  2. Has Science Diet been recalled?
  3. Which flavors and recipes get our top ratings?

But first…

Which Hill’s Science Diet sub-brand is right for you?

Science Diet offers 6 popular sub-brands. We’ll share what makes each one different. So, you can choose the option that best meets your dog’s needs.

Hill's Science Diet Adult

Hill's Science Diet Adult

Science Diet’s most popular dry kibble. Each recipe is made with grain and optimized specifically for adult nutrition.

  • 11 recipes just for small dogs
  • 8 options for large breeds
  • 5 recipes for sensitive stomach and skin
  • Not recommended for puppies
  • 27 recipes (ratings vary)
Rating:
star
star
star
star
star

View all Recipe Ratings

Hill's Science Diet Dry Puppy

Hill's Science Diet Dry Puppy

This sub-brand includes Hill’s best-selling dry and fully balanced puppy recipes.

  • Healthy grain-inclusive formula
  • 2 large breed puppy foods. Lower risk of hip disease
  • 6 recipes (ratings vary)
Rating:
star
star
star
star
star

View all Recipe Ratings

Hill's Science Diet Wet Puppy

Hill's Science Diet Wet Puppy

This sub-brand offers Science Diet’s leading canned food that’s optimized for puppies.

  • Fully balanced, protein-rich blend
  • Not suitable for large breed puppies
  • 4 recipes (ratings vary)
Rating:
star
star
star
star
star

View all Recipe Ratings

Hill's Science Diet Adult Plus Dry

Hill's Science Diet Adult Plus Dry

Hill’s Adult Plus dry formulas are made with grain. Each recipe is specifically optimized for senior dogs.

  • 5 recipes designed for small breed seniors
  • 2 formulas for large breed seniors
  • 11 dry recipes (ratings vary)
Rating:
star
star
star
star
star

View all Recipe Ratings

Hill's Science Diet Adult Wet Dog Food

Hill's Science Diet Adult Wet Dog Food

Hill’s Adult Wet formulas are ideal for dogs considered fully grown. They are not suitable for puppies.

  • 3 recipes for sensitive stomach and skin
  • Not for puppies of any breed
  • 15 recipes (ratings vary)
Rating:
star
star
star
star
star

View all Recipe Ratings

Hill's Science Diet Perfect Weight

Hill's Science Diet Perfect Weight

As you can tell by its name, this Science Diet dry sub-brand is designed for dogs who need to lose weight. Recipes are all grain-inclusive.

  • Reduced caloric-density for controlled weight loss
  • Contains L-carnitine to promote steady weight loss
  • 4 recipes (ratings vary)
Rating:
star
star
star
star
star

View all Recipe Ratings

Review of Hill's Science Diet Dog Food

Rating:
star
star
star
star
star

Which Hill’s Science Diet Adult Dry Recipes Get Our Best Ratings?

Hill’s Science Diet Adult dry product range is made up of 27 recipes with ratings varying from 2.5 to 4 stars. The average rating of the whole range is 3 stars.

The table below shows each recipe in this range including our rating and the AAFCO nutrient profile: Growth (puppy), Maintenance (adult), All Life Stages, Supplemental or Unspecified.

Product line Rating AAFCO
Hill's Science Diet Adult Chicken and Barley 3 M
Hill's Science Diet Adult Healthy Mobility Large Breed 2.5 M
Hill's Science Diet Adult Healthy Mobility Small Bites 2.5 M
Hill's Science Diet Adult Lamb Meal and Brown Rice 3 M
Hill's Science Diet Adult Large Breed Chicken and Barley 3 M
Hill's Science Diet Adult Large Breed Lamb Meal and Brown Rice 3 M
Hill's Science Diet Adult Large Breed Light 3.5 M
Hill's Science Diet Adult Large Breed No Corn, Wheat, Soy 3.5 M
Hill's Science Diet Adult Light Small and Mini 4 M
Hill's Science Diet Adult Light Small Bites 3.5 M
Hill's Science Diet Adult Light 3.5 M
Hill's Science Diet Adult No Corn, Wheat, Soy 3. M
Hill's Science Diet Adult Oral Care 3.5 M
Hill's Science Diet Adult Oral Care Small and Mini 3.5 M
Hill's Science Diet Perfect Digestion 3.5 M
Hill's Science Diet Adult Perfect Digestion Salmon, Whole Oats, and Brown Rice 3.5 M
Hill's Science Diet Adult Sensitive Stomach and Skin Grain Free 3.5 M
Hill's Science Diet Adult Sensitive Stomach and Skin Large Breed 4 M
Hill's Science Diet Adult Sensitive Stomach and Skin Pollock Meal and Insect 4 M
Hill's Science Diet Adult Sensitive Stomach and Skin Small and Mini Chicken 4 M
Hill's Science Diet Adult Sensitive Stomach and Skin Small Bites 2.5 M
Hill's Science Diet Adult Small and Mini Chicken Meal and Rice 4 M
Hill's Science Diet Adult Small and Mini Lamb Meal and Brown Rice 3.5 M
Hill's Science Diet Adult Small Bites Chicken and Barley Recipe 3 M
Hill's Science Diet Adult Small Bites Lamb Meal and Brown Rice 3 M
Hill's Science Diet Adult Small Bites No Corn, Wheat, Soy 3.5 M
Hill's Science Diet Adult Sensitive Stomach and Skin 4

Recipe and Label Analysis

Hill’s Science Diet Adult Light Small and Mini was selected to represent the other products in the line for detailed recipe and nutrient analysis.

Hill's Science Diet Adult Light Small and Mini

Estimated Dry Matter Nutrient Content

25%

Protein

8.3%

Fat

58.7%

CarbsCarbohydrates

Chicken meal, cracked pearled barley, pea fiber, brown rice, whole grain corn, corn gluten meal, powdered cellulose, whole grain oats, soybean meal, whole grain sorghum, brewers rice, chicken liver flavor, soybean oil, pea protein, dried beet pulp, flaxseed, lactic acid, pork liver flavor, potassium chloride, calcium carbonate, iodized salt, vitamins (vitamin E supplement, l-ascorbyl-2-polyphosphate (source of vitamin C), niacin supplement, thiamine mononitrate, vitamin A supplement, calcium pantothenate, riboflavin supplement, biotin, vitamin B12 supplement, pyridoxine hydrochloride, folic acid, vitamin D3 supplement), choline chloride, l-lysine, minerals (ferrous sulfate, zinc oxide, copper sulfate, manganous oxide, calcium iodate, sodium selenite), taurine, mixed tocopherols for freshness, natural flavors, l-carnitine, beta-carotene


Fiber (estimated dry matter content) = 12.3%

Red denotes any controversial items

Estimated Nutrient Content
Method Protein Fat Carbs
Guaranteed Analysis 25% 8% NA
Dry Matter Basis 25% 8% 59%
Calorie Weighted Basis 24% 19% 57%

Ingredients Analysis

The first ingredient in this dog food is chicken meal. Chicken meal is considered a meat concentrate and contains nearly 300% more protein than fresh chicken.

The second ingredient is cracked pearl barley, which is a starchy carbohydrate supplying fiber and other healthy nutrients. However, aside from its energy content, this cereal grain is of only modest nutritional value to a dog.

The third ingredient is pea fiber, a mixture of both soluble and insoluble dietary fiber derived from pea hulls. Aside from the usual benefits of fiber, this agricultural by-product provides no other nutritional value to a dog.

The fourth ingredient is brown rice, a complex carbohydrate that (once cooked) can be fairly easy to digest. However, aside from its natural energy content, rice is of only modest nutritional value to a dog.

The next item is corn, an inexpensive and controversial cereal grain. And aside from its energy content, this grain is of only modest nutritional value to a dog.

For this reason, we do not consider wheat a preferred component in any dog food.

The sixth ingredient is wheat. Wheat is another cereal grain and subject to the same issues as corn (previously discussed).

The seventh ingredient is powdered cellulose, a non-digestible plant fiber usually made from the by-products of vegetable processing. Except for the usual benefits of fiber powdered cellulose provides no nutritional value to a dog.

The eighth ingredient is soybean meal, a by-product of soybean oil production more commonly found in farm animal feeds.

Although soybean meal contains 48% protein, this ingredient would be expected to have a lower biological value than meat.

And less costly plant-based products like this can notably boost the total protein reported on the label – a factor that must be considered when judging the actual meat content of this dog food.

The ninth ingredient is sorghum. Sorghum (milo) is a starchy cereal grain with a nutrient profile similar to corn.

Since it is gluten-free and boasts a smoother blood sugar behavior than other grains, sorghum may be considered an acceptable non-meat ingredient.

 

 

Hills Science Diet Large Breed Adult

From here, the list goes on to include a number of other items.

But to be realistic, ingredients located this far down the list (other than nutritional supplements) are not likely to affect the overall rating of this Science Diet product.

With seven notable exceptions

First, soybean oil is red flagged here only due to its rumored (yet unlikely) link to canine food allergies.

However, since soybean oil is high in omega-6 fatty acids and contains no omega-3’s, it’s considered less nutritious than flaxseed oil or a named animal fat.

Next, we find flaxseed, one of the best plant sources of healthy omega-3 fatty acids. Provided they’ve first been ground into a meal, flax seeds are also rich in soluble fiber.

However, flaxseed contains about 19% protein, a factor that must be considered when judging the actual meat content of this dog food.

In addition, we note the use of taurine, an important amino acid associated with the healthy function of heart muscle. Although taurine is not typically considered essential in canines, some dogs have been shown to be deficient in this critical nutrient.

This recipe also contains sodium selenite, a controversial form of the mineral selenium. Sodium selenite appears to be nutritionally inferior to the more natural source of selenium found in selenium yeast.

Hills Science Diet Small Breed Adult

We also find no mention of probiotics, friendly bacteria applied to the surface of the kibble after processing to help with digestion.

Next, beet pulp. Beet pulp is a controversial ingredient, a high fiber by-product of sugar beet processing.

Some denounce beet pulp as an inexpensive filler while others cite its outstanding intestinal health and blood sugar benefits.

We only call your attention here to the controversy and believe the inclusion of beet pulp in reasonable amounts in most dog foods is entirely acceptable.

And lastly, the minerals listed here do not appear to be chelated. And that can make them more difficult to absorb. Chelated minerals are usually associated with higher quality dog foods.

Nutrient Analysis

Based on its ingredients alone, Hill’s Science Diet Adult looks like an average dry kibble.

The dashboard displays a dry matter protein reading of 25%, a fat level of 8.3% and estimated carbohydrates of about 58.7%.

As a group, the brand features an average protein content of 24.4% and a mean fat level of 14.8%. Together, these figures suggest a carbohydrate content of 52.8% for the overall product line.

And a fat-to-protein ratio of about 61%.

Which means this Science Diet product line contains…

Below-average protein. Near-average fat. And above-average carbs when compared to other dry dog foods.

When you consider the protein-boosting effect of the soybean meal, flaxseed and peas in this recipe, and the corn gluten meal contained in other recipes, this looks like the profile of a kibble containing just a moderate amount of meat.

Hill's Dog Food Recall History

The following automated list (if present) includes all dog food recalls related to Hill's through July 2024.

No recalls noted.

You can view a complete list of all dog food recalls since 2009 here.

Our Rating of Hill's Science Dog Food

Hill’s Science Diet Adult is a grain-inclusive dry dog food using a moderate amount of named meat meals as its dominant source of animal protein, thus earning the brand 3 stars.

star
star
star
star
star

Recommended with Reservations

Who owns Hill's Science Diet and where is it made?

Hill’s Pet Nutrition is owned by the Colgate-Palmolive Company.

Hill’s Science Diet products are made in the United States. The company operates major facilities in Bowling Green, Kentucky, Topeka and Emporia, Kansas, Richmond, Indiana as well as the Czech Republic and the Netherlands.

What Do Others Say About Hill's Science Dog Food?

At the time of this update…

Chewy customers rate Hill’s Science Diet Adult Large Breed 4.6 out of 5 stars… and 94% say they would recommend it to others.

Here’s an actual user review

Sample buyer review… “I’ve tried 2 other brands for our German Shepherd and after 10 months her bathroom business continued to be a mess. So since she was almost a year old I switched her to the Hills Diet. After a couple weeks her poop was noticeably more solid so that we could easily pick it up on walks and in the yard. I think that’s a great barometer to see if her body works well with this food – and it does!”

Read more buyer reviews at Chewy.com

Frequently Asked Questions

How does Hill's maintain the safety and quality of its pet foods?

The following video was produced by Hill’s Pet Nutrition. Watching it, of course, is optional. However, we believe the video does an exceptional job of revealing the meticulous nature of the company’s safety and manufacturing practices.

How to switch to Hill's Science Diet... without making your dog sick

In this short video

Dr. Gary Richter shares a simple feeding tip that can help lower your dog’s risk of getting sick when you switch to any new food… like Hill’s Science Diet.

Is Hill's Science Diet a healthy dog food?

Every Hill’s Science Diet recipe meets 100% of the canine nutrient requirements recommended by the Association of American Feed Control Officials.

Each is considered complete and balanced for the specific life stage indicated on the package… and is based on nutrient standards established by the National Research Council of the National Academies of Science, in Washington, DC.

How does Hill's Science Diet puppy food compare to other brands?

Science Diet offers 10 healthy puppy formulas… 6 dry puppy foods and 4 wet puppy foods.

Since large breeds are more likely to develop a crippling and permamnent form of hip disease if they’re fed a diet that contains too much calcium, it’s crucial to choose a puppy food that matches your dog’s age and breed size.

Compare Hill’s puppy food to The Dog Food Advisor’s Best Dry Puppy Food and Best Wet Puppy Foods.

Is Hill's Science Diet good for older dogs?

Science Diet Adult Plus is designed specifically for older dogs. On average, Hill’s dry recipes contain about 21% dry matter protein. And Hill’s wet recipes contain just 22% protein. Unfortunately, these figures are far below-average for most better quality senior brands.

For comparison, visit The Dog Food Advisor’s best senior dog food pages here.

Does Hill's Science Diet offer any grain-free dog foods?

The overwhelming majority of Science Diet dog foods have grain-inclusive designs. However, Hill’s does produce a limited number of grain-free recipes. For example, you can read our review of Hill’s Science Diet Grain Free Dry here.

A Final Word

The Dog Food Advisor does not accept money, gifts, samples or other incentives in exchange for special consideration in preparing our reviews.

However, we do receive a referral fee from online retailers (like Chewy or Amazon) and from sellers of perishable pet food when readers click over to their websites from ours. This helps cover the cost of operation of our free blog. Thanks for your support.

For more information, please visit our Disclaimer and Disclosure page.

Share via
Copy link