The Collaborative International Dictionary of English v.0.48:
Blenheim spaniel \Blen"heim span"iel\ [So called from Blenheim House, the seat of the duke of Marlborough, in England.] A small variety of spaniel, kept as a pet. [1913 Webster]WordNet (r) 3.0 (2006):
Blenheim spaniel n 1: red-and-white variety of English toy spaniel