Science Diet is a brand of cat and dog foods marketed by Hill's Pet Nutrition, Inc.[1] (a subsidiary of the Colgate-Palmolive Company).

Science Diet was developed in the 1960s[2] by Mark L. Morris, Jr. PhD DVM (February 3, 1934 – January 14, 2007).

Dr. Morris Jr. was the son of veterinarian Dr. Mark Morris Sr. DVM, who pioneered the field of veterinary clinical nutrition after being asked to formulate a specialized diet for the original seeing-eye dog, Buddy, a female German Shepherd with kidney disease.

That success led Dr. Morris Sr. and his son to devise additional condition-specific and life-stage pet food formulas under the Prescription Diet and Science Diet brand names.

[3] The Hill's Science Diet and Hill's Prescription Diet brands steadily gained market share, peaking in 2008 at 10.7% of dog food sales, but by 2011, this had dropped to 9.4% with shifts in consumer preferences toward pet foods marketed as "natural" and consumer perceptions of Science Diet as being "artificial".