Question: The Chesapeake Bay Retriever and Newfoundland are both breeds of what?
Sentence (from "Canine degenerative myelopathy"): Onset is typically after the age of 7 years and it is seen most frequently in the German shepherd dog, Pembroke Welsh corgi, and boxer dog, though the disorder is strongly associated with a gene mutation in SOD1 that has been found in 43 breeds as of 2008, including the wire fox terrier, Chesapeake Bay retriever, Rhodesian ridgeback, and Cardigan Welsh corgi.
Relevant evidence: No