Hill’s Science Diet Adult Dog Food Review (Dry)

Hill’s Science Diet Adult dry product range is made up of 47 recipes with ratings varying from 1 to 4 stars. The average rating of the whole range is 2.5 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.

Recipe and Label Analysis

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

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 two items are corn meal and whole grain 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 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 whole grain oats. With the exception of their caloric content and the fact they’re also gluten free, oat can be considered average in nutritional value.

The ninth 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.

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.

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 22%, a fat level of 6% and estimated carbohydrates of about 64%.

As a group, the brand features an average protein content of 22% and a mean fat level of 13%. Together, these figures suggest a carbohydrate content of 57% for the overall product line.

And a fat-to-protein ratio of about 57%.

Which means this Science Diet product line contains…

Below-average protein. Below-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 December 2024.

No recalls noted.

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

Our Rating of Hill's Science Diet Grain-inclusive 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 2.5 stars.

Not Recommended

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