The Welsh Terrier is a sturdy, compact, rugged dog of medium size with a coarse wire-textured coat. The legs, underbody and head are tan; the jacket black (or occasionally grizzle). The tail is docked to length meant to complete the image of a "square dog" approximately as high as he is long. The movement is a terrier trot typical of the long-legged terrier. It is effortless, with good reach and drive. The Welsh Terrier is friendly, outgoing to people and other dogs, showing spirit and courage. The "Welsh Terrier expression" comes from the set, color, and position of the eyes combined with the use of the ears.
The entire head is rectangular. The eyes are small, dark brown and almond-shaped, well set in the skull. They are placed fairly far apart. The size, shape, color and position of the eyes give the steady, confident but alert expression that is typical of the Welsh Terrier. The ears are V-shaped, small, but not too thin. The fold is just above the topline of the skull. The ears are carried forward close to the cheek with the tips falling to, or toward, the outside corners of the eyes when the dog is at rest. The ears move slightly up and forward when at attention.
The neck is of moderate length and thickness, slightly arched and sloping gracefully into the shoulders. The throat is clean with no excess of skin. The topline is level.
The body shows good substance and is well ribbed up. There is good depth of brisket and moderate width of chest. The loin is strong and moderately short. The tail is docked to a length approximately level (on an imaginary line) with the occiput, to complete the square image of the whole dog. The root of the tail is set well up on the back. It is carried upright.
The front is straight. The shoulders are long, sloping and well laid back. The legs are straight and muscular with upright and powerful pasterns. The feet are small, round, and catlike. The pads are thick and black. The nails are strong and black; any dewclaws are removed.
The coat is hard, wiry, and dense with a close-fitting thick jacket. There is a short, soft undercoat. Furnishings on muzzle, legs, and quarters are dense and wiry.
The hindquarters are strong and muscular with well-developed second thighs and the stifles well bent. The hocks are moderately straight, parallel and short from joint to ground. The feet should be the same as in the forequarters.