Form the Sussex, England, where the first breeder of these liver-golden dogs was, the Sussex Spaniel has been around for 150 years. Its sturdy body close to the ground qualifies its slowness; its sense of smell is faster than its feed, but it is very decisive and can continue hunting by foot. Own. Norman and Constance Grenier.
Solidly built, active and energetic, the Sussex Spaniel is a dog with a rich liver color standing between 33 and 38 cm with a weigh between 17 and 22 kg for the AKC; for the FCI and the KC between 38 and 41 cm and 23 kg. It is a rectangular dog, with the body longer than tall. It is a muscular hunter, with a free movement and a notably somber and serious expression. The head is moderate length, not narrow, well proportioned and with a good stop; the eyebrows are quite heavy, with a well marked occipital. The muzzle is wide and square, not week. The eyes, with a sweet expression, they are hazelnut color and quite large. The ears are thick, quite large, with a good lobe, and low insertion. The back is leveled and long, very muscular in width and depth; the limbs poised under the body and very short, strong and heavy boned; the hindquarters full and round, parallel and well separated; the feet are large and round. The color is very distinctive in the Sussex, and the golden liver should not be dark or dull; white at the chest is not desirable. The coat is abundant, straight, with no tendency to curling; the undercoat is very strong to resist the outdoors; moderate bristles at the limbs; ears provided with soft, wavy hair; moderate stripes at the tail; the hair is longer between the fingers covering the nails. The tail, low inserted, never carried over the back level, is docked from 12 to 17 cm, in countries where allowed, otherwise natural.
It is a peaceful, warm and loyal breed, and its almost human personality is reflected in its beautiful hazelnut colored eyes. The Sussex is never nervous or reserved. It is a possessive animal that grows fond of its people, a true family dog that loves the domestic life. Don’t be fooled by its size and temperament: it is an active and lively hinter that enjoys this activity. It is sensitive, so it should be educated with affection, and it will respond well.
What you see is what you get: the Sussex Spaniel loves the family life and is comfortable slumbering next to its master’s slippers. But don’t be fooled, the Sussex Spaniel needs outdoor activity, so provide it. 
Begin your Sussex Spaniel puppy’s education from day one. Even the nicest puppy will want to get away with things. Early education stimulates its social behavior and will make it clean at home. Own. Ann S. Cummings.
Although it is a dog with substance, at birth it only weighs between 110 and 170 g. The tails is docked at less than two thirds, as well as dewclaws during the first week. Growth is slow at the beginning. A Sussex puppy weighs only 1.5 kg after five weeks. But later, growth is accelerates, and after eight weeks a weigh from 3 to 6 kg can be expected. Physical maturity can take up to two years. The buyer should choose a dog with short limbs, heavy bones, large feet and a long body. The temperament should be sweet and calm. During adolescence the color lightens. Sun is necessary to get the adecquate color. It eats normally, although the adult usually needs less amount of food than other breeds with the same size. Obesity should be avoided.
The show puppy should have short legs, large feet and decidedly heavy bone structure. 
The Sussex Spaniel puppies are convinced that the world is a great place. If you are lucky enough to find a Sussex Spaniel litter, you will be tempered to take this sweet doll home. 
The Sussex Spaniel has little hereditary health issues and enjoys a 15 year longevity. In essence the Sussex is an easy to care for dog, and its exercise and brushing needs are not excessive. Its hunting instinct is intact, and the owner is advised to give it an opportunity to exercise regularly. Long stripes should be kept knot free, and it is convenient to clip the excess hair under the ears and around the anus. The Sussex ears are prone to otitis and infections, for which the owner should keep them clean and free of wax accumulation. Serious problems affecting the breed are congenital heart diseases and carcinomas, especially in older dogs. Hip dysplasia has low incidence, and breeders inform that affected specimens are not serious cases.