He became a vegetarian in 1974 after seeing a stockyard in Texas and experiencing the "smell, terror and anxiety."He became an ethical vegan while playing the character of Farmer Hoggett in the movie Babe in 1995. He frequently speaks out on issues regarding animal cruelty for PETA, largely the treatment of pigs.
Cromwell is known for his tall stature; at 6 ft 7 in (2.01 m), he is the tallest actor nominated for an Academy Award.