ST. PAUL, Minn. — Travelers taking their dogs to Mexico should have them checked for a screwworm parasite when they arrive home. State veterinarian Brian Hoefs said dogs are especially vulnerable to the destructive parasite. Because of outbreaks in Mexico, the U.S. Agriculture Department has blocked imports of cattle and horses. “Pets are susceptible as well,” Hoefs said. Screwworm larvae feed on living tissue.
