To the best of my knowledge, cocker spaniel is not a proper name therefore it is not capitalized. If a dog breed includes a proper name then that part is capitalized (i.e. American cocker spaniel, Labrador retriever).
Cocker spaniel news, information, media, and online community
To the best of my knowledge, cocker spaniel is not a proper name therefore it is not capitalized. If a dog breed includes a proper name then that part is capitalized (i.e. American cocker spaniel, Labrador retriever).