[citation needed] In 1948, Mark L. Morris contacted Hill Packing Company to produce Canine k/d.

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

[12] Prescription Diet is a line of pet food formulated to help cats and dogs with health issues.

[13][14][15][16] On January 31, 2019, Hill's recalled 25 varieties of its canned dog food, because of elevated levels of vitamin D, due to a supplier error.

[17] On February 12, 2019, San Francisco law firm Schubert Jonckheer & Kolbe filed a class action lawsuit in the United States District Court for the Northern District of California against Hill's on behalf of affected owners for distributing dog food which contained potentially toxic levels of vitamin D.[18][19]