As of March 2015, the best-rated brands of dog food are Taste of the Wild, Hill's Science Diet, Diamond Naturals and Wellness, according to the customer reviews and sales of the brands on Amazon.com. One Taste of the Wild formula is the bestseller among all dry dog foods on Amazon.com.
Wellness and Taste of the Wild are grain-free foods that Amazon.com users rate 4.7 and 4.6 stars out of 5, respectively. Taste of the Wild has two other formulas that Amazon.com users rate equally.
Hill's Science Diet's highest-rated formula has a 4.5-star rating, with users highlighting its affordability.
Diamond Naturals is the bestselling dehydrated dog food on Amazon.com, and users rate it 4.2 stars out of 5. The beef and rice formula focuses on antioxidants and healthy fatty acids.