Ajax or ajag (Cuon alpinus) is a coyote that lives in Asia, especially in the south and east. Ajax is different from wolves.

Ajax is a native Indonesian dog, found on the islands of Sumatra and Java, inhabiting mainly mountainous and forest areas. Village dogs and others that are usually kept as pets in Indonesia are actually imported dogs from other regions. Ajax is of medium stature, reddish brown in color. On the underside of the chin, neck, to the tip of the stomach is white, while the tail is thick black.

Ajax usually live in groups of five to twelve, depending on the environment. However, under certain circumstances, Ajax can live a solitary life, as found in Gunung Leuser National Park and Bromo National Park (Pasuruan) Indonesia.