Cocker spaniel dam and pups pictured in the book Dog Owners Guide by Kasco Mills, Inc, 1950From the book The Dogs of the British Islands by Stonehenge, 1872From the book British dogs their varieties, history, characteristics, breeding, management and exhibition by Hugh Dalziel, 1879Breeder and Sportsman, May 8, 1886From the book Toy Dogs by Muriel Handley Spicer, 1902From the book Hare-hunting and harriers; with notices of beagles and basset hounds by H. A. Bryden, 1903
Note: Black treacle (mentioned below) is a British thing, similar to blackstrap molasses.
From the book Sporting Dogs; Their Points and Management in Health and Disease by Frank Townend Barton, 1910From the book Hounds and Hunting through the Ages by Joseph B. Thomas, 1937From Dog Owners Guide by Kasco Mills, Inc, 1950From the classifieds in The Dog Fancier, September 1908