Princess Kate’s brother has hit out at an international airline in a fresh statement. James Middleton has slammed Air France after claiming an airline allegedly lost a dog in their care. The Princess of Wales’s brother, 37, shared a Change.org petition asking Air France to take “accountability for negligence” with his 345,000 Instagram followers. The petition outlines how Ramón Alberto Piriz began his journey from the UK to Argentina with his friend’s dog Sombra on August 22. Upon arrival at Heathrow Airport, Piriz was told by Air France flight attendants that his dog was too heavy to travel i…