Do cows have four stomachs?
No, they have one stomach with four compartments: the rumen, the reticulum, omasum, and the abomasum.
Four stomachs are wrong expression. They actually have 4 chambers viz. Rumen , Reticulum, Omasum and Abomasum. Rumen is the largest Chamber meant for food storage and Abomasum is the true stomach which secretes gastric juices.