The body length must be in proportion to the height, and it should present a compact, balanced image, always being in solid, hard condition. The head Should be well balanced and in proportion to the body. The skull should be flat, of moderate width at the ears, narrowing to the eyes. There should be a defined stop but not overpronounced. The length of the muzzle from the nose to the stop should be slightly shorter than the distance from the stop to the occiput. The nose should be black.
Jack Russell Terrier