Raw food is usually restricted to any food that hasn't been heated or warmed above 48 degrees celsius. Raw foods are uncooked unprocessed including fruits, vegetables, nuts, seeds, and sprouted grains, eggs, meat, fish.

Rawhide is dried animal skin that has been prepared for bones and treats.

Rendering is the process of converting waste animal tissue into stable, usable materials. Rendering can refer to any processing of animal products into more useful materials, or to the rendering of whole animal fatty tissue into purified fats like lard or tallow.

Ruminating animals, ruminants, are herbivorous grazing animals that have a four-chambered stomach. They are the only animals that can digest their food without thoroughly chewing it. Commonly known ruminant animals include cows, sheep, goats, moose, camels, deer, buffalo, and giraffe.