Note: the UK Kennel Club only recognises the small, i.e. pequeno, size and not the medio or grande. The UK standard also varies slightly from the official FCI standard, which you can download below. (FCI = Fédération Cynologique Internationale, i.e. the World Canine Organisation.)
General appearance Small, sturdy, slightly longer than high.
Characteristics A primitive dog used primarily for hunting rabbits. A keen, alert and agile dog who hunts by scent, sight and hearing.
Temperament Sociable, intelligent and lively.
Head and skull Lean, fine, seen as a broad based wedge when viewed from above and in profile. Flat or slightly arched skull. Occipital bone slightly prominent. Stop moderately defined. Muzzle shorter than the skull, appears as a blunt wedge when in profile, with a slightly protruding nose. Lips thin, black and tight fitting.
Eyes Expressive, moderate in size, not prominent, set obliquely. Colour varies according to coat colour, from light to dark brown.
Ears Triangular, large and thin. Broad at the base tapering to a fine point. Set on medium high and obliquely. Very mobile, carried erect and forward when alert. Length of ear greater than width at base.
Mouth Jaws strong with a perfect, regular and complete scissor bite, i.e. upper teeth closely overlapping lower teeth and set square to the jaw.
Neck Straight and of medium length. Strong, well muscled. Free from throatiness.
Forequarters Forelegs straight and parallel. Well-laid, muscular shoulders. Pasterns short, strong and slightly sloping.
Body Length of body from point of shoulder to point of buttock greater than height at withers. Topline level, slight rise over loin. Moderate forechest. Chest fairly deep, not too wide. Ribs moderately well sprung and carried well back. Underline rising slightly.
Hindquarters Strong and muscular. Moderately angulated with firm hocks and moderate length of rear pasterns. Legs parallel when viewed from behind.
Feet Strong and round, toes tight and well arched. Nails strong, short and preferably dark. Firm pads.
Tail Medium length, high set. Thick at the base tapering to a fine point. Curved over the back when moving. Never curled.
Gait/movement Swift and light footed. Sound.
Coat Smooth or wire coated. Never trimmed. Skin thin and close fitting. Smooth coated: Short and very dense. Wire coated: Rough and harsh, but not as dense as the smooth coat and without undercoat. Distinct beard.
Colour Yellow, fawn (in all shades from light to dark), black (diluted or faded), with or without white markings. White only if accompanied by markings of one of the listed colours.
Faults Any departure from the foregoing points should be considered a fault and the seriousness with which the fault should be regarded should be in exact proportion to its degree and its effect upon the health and welfare of the dog and on the dog’s ability to perform its traditional work.
Note Male animals should have two apparently normal testicles fully descended into the scrotum.