The Cocker Spaniel is already the smallest functional Spaniel breed out there. If you want a smaller dog in the Spaniel family, look into one of the several toy and companion breeds derived from the Spaniels - the Miniature and Toy Poodle, Papillon and Phalene, Bichon Frise, Maltese, Havanese, English Toy Spaniel, and Cavalier King Spaniel for starters. read more
A miniature cocker spaniel is a crossbreed between a purebred cocker spaniel and a purebred toy breed that produces miniature-sized puppies. There are several toy breeds used; perhaps the most common is an English cocker spaniel mixed with an English toy spaniel, according to the Dog Breeding Info Center. read more