The deal was valued at $7.6 billion (6 billion pounds) when it was announced in August 2019.

The FTC action was the final antitrust approval needed, and the proposed transaction is on track to close in early August, Elanco said in a statement.

To win antitrust approval, the FTC said it required the companies to sell assets related to oral treatments to kill fleas on dogs, an inflammation of dogs' inner ears and some pour-on cattle insecticides which control multiple insects.

The deal won EU antitrust approval in June.

"This approval marks the near-final step in fulfilling our vision of bringing together two dedicated animal health companies," Elanco Chief Executive Jeff Simmons said in a statement.

The transaction would create the world's second largest animal health company, with analysts expecting the $44 billion animal health sector to grow 5%-6% per year, driven by an increase in livestock farming and spending on pets.

The FTC said that Elanco agreed to sell its canine ear medicine Osurnia to Dechra Pharmaceuticals PLC, its dog flea medicine Capstar to PetIQ Inc and its cattle pour-on insecticide treatment StandGuard to Neogen Corp.

(Reporting by Diane Bartz; Editing by Chizu Nomiyama and Marguerita Choy)