Dog and Cat Meat Trade Prohibition Act of 2018 (Sec. 2) This bill prohibits persons from knowingly slaughtering a dog or cat for human consumption. In addition, the bill prohibits persons from knowingly transporting, possessing, buying, selling, or donating: (1) a dog or cat to be slaughtered for human consumption, or (2) dog or cat parts for human consumption. The bill subjects a violator to a fine. The bill applies to conduct in or affecting interstate or foreign commerce or within the special maritime and territorial jurisdiction of the United States. However, it does not apply to an activity carried out by an Indian for a religious ceremony.