The dogs were returned from Australia to the United States by private jet, in May, when agriculture minister, Barnaby Joyce, threatened to have them put down.

It was alleged that quarantine procedures were ignored when the couple arrived in Australia to film the latest Pirates of the Caribbean movie on the Gold Coast.

The Department of Agriculture confirmed the summons had been issued to the 29-year-old actress. “Ms Amber Heard was served with a summons issued by the Commonwealth Director of Public Prosecutions on July 14,” a statement read.

“The CDPP’s action follows an incident where a biosecurity officer attended a Gold Coast property in April and found two dogs alleged to be illegally imported.

“All animals entering Australia must have an import permit, and have undergone relevant testing and health checks signed off by a government veterinarian from the exporting country, to ensure pests and diseases from overseas are not brought here.”

The Commonwealth DPP issued the summons on Tuesday, for Heard to appear in Southport local court on September 7. Fines could reach up to €300,000.