Royal Canin U.S.A., Inc., et al., Petitioners v. Anastasia Wullschleger, et al.

The Supreme Court ruled that when a plaintiff amends their complaint to remove all federal claims after a case has been moved to federal court, the federal court loses jurisdiction over the remaining state-law claims. The Court held that jurisdiction is determined by the amended complaint, meaning the case must be sent back to state court once the federal questions are gone.