What happens if leopards formed a pair of secondary gills?

If leopards were to develop a pair of secondary gills, it would imply a significant evolutionary adaptation. Gills are respiratory organs that allow aquatic animals to extract oxygen from water, so the presence of gills on a land animal like a leopard would suggest a transition towards an amphibious or fully aquatic lifestyle. This adaptation would require complex physiological changes to support underwater respiration and would likely impact the leopard's behavior, habitat, and diet.