The Phu Quoc Ridgeback is a rare breed of dog from the island of Phú Quốc in Kiên Giang Province in southern Vietnam. It is one of three ridgeback breeds, the others being the Rhodesian Ridgeback and the Thai Ridgeback. It is not recognized by the Fédération Cynologique Internationale or any other major club. The Phu Quoc Ridgeback is one of the four native Vietnamese dog breeds, along with the Bắc Hà dog, Lài dog, Hmong Bobtail Dog.

The Rhodesian Ridgeback is a large dog breed originally bred in Southern Africa. The original breed standard was drafted by F.R. Barnes, in Bulawayo, Southern Rhodesia, in 1922, and approved by the South African Kennel Union in 1927. Its forebears can be traced to the semi-domesticated ridged hunting and guardian dogs of the Khoikhoi. These were interbred with European dogs by the early colonists of the Cape Colony for assisting in the hunting of lions.