American Cocker Spaniel weigh 24 to 28 pounds (11 to 12.75 kg) and stand 15 inches (38 cm) maximum height. and they come in three major color varieties: black, ASCOB (Any Solid Color Other than Black) and particolor. The other solid colors are chocolate, red, buff, and sable. Particolor dogs are all of the above colors and white. Black and tan, chocolate and tan, and tricolor (white, black and tan) are also common. Roan (black and white or red and white hairs interminged) occurs rarely. Both black and brown sable colors with or without white or tan markings are recognized in Canada, but are disqualified in the United States

This dog temperament is typically joyfull, trusting, and intelligent. The ideal Cocker temperament is merry, outgoing, and eager to please everyone. They tend to be “softer” dogs who do not do well with rough or harsh training. The popularity of the American Cocker Spaniel led to a considerable amount of irresponsible breeding in an attempt to keep up with the demand. They are all different colors including black and white. The results have included fearful or aggressive behavior in some of the dogs, submissive urination, and resource guarding. Responsible breeders have worked diligently to eliminate these negative characteristics while trying to educate the public regarding responsible breeding. Temperament of the American Cocker Spaniel should always be the primary concern when breeding these dogs. As with all puppies, owners are advised to choose their breeder carefully.
and if we talk about their health, this dog are susceptible to a variety of maladies, particularly infections affecting their ears and, in some cases, their eyes. As a result, they may require more medical attention than some other breeds. Common eye problems in Cockers include progressive retinal atrophy (PRA), glaucoma, and cataracts. The American Spaniel Club recommends annual eye exams by a veterinary ophthalmologist for all dogs used for breeding. Autoimmune problems in Cockers include autoimmune hemolytic anemia (AIHA) and ear inflammations. Less common are luxating patellas
and hip dysplasia. Dogs used for breeding can be checked for both of these conditions, and dogs
free of hip dysplasia can be certified by the Orthopedic Foundation for Animals

source :wikipedia