Murray River Curly Coated Retriever Association - www. mrccr. org This article may contain original research. Please improve it by verifying the claims made and adding references. Statements consisting only of original research may be removed. More details may be available on the talk page. The Murray River Curly Coated Retriever (MRCCR) is a breed of dog endemic to South East Australia. It appears to be have been developed as a working duck dog in the 19th century.