BRIEF HISTORICAL SUMMARY:
The Jack Russell Terrier originated in England by 1800. Thanks to the efforts of the Reverend John Russell. The developed a style of Fox Terriers that fit to your needs, those of a dog run with their foxhounds and that also could release to the Earth by the Fox and other prey. These included basically two varieties with similar standards, except for any difference, mainly in height and proportions, the highest, built more square, known as the Parson Russell Terrier and the lower, slightly more long, it is known as the Jack Russell Terrier.
A terrier of strong, active, work of great character with flexible, long medium body. His deft movement goes with his acute expression. The Court of tail is optional and the mantle can be short, hard or brittle.
• The dog as a whole is longer than high.
• The depth of the body from the cross to the chest must be equal to the length of the front leg of the elbow to the ground.
• The periphery behind the elbows must be 40 to 43 cm.
TEMPERAMENT / BEHAVIOR:
Lively Terrier, alert and active, with an acute and intelligent expression. Bold and fearless, friendly but quietly confident.
Skull: The skull should be flat and wide moderate gradually decreasing its width to the eyes and slimming to a wide muzzle.
Fronto-nasal depression (Stop): Well-defined but not pronounced.
Snout: The length from the stop to the truffle should be slightly shorter than the stop to the back of the head.
Lips: Tight and pigmented black.
JAWS / teeth: Very strong, deep, wide and powerful. Strong closing in scissor teeth.
Eyes: Small dark and poignant expression. They should not be prominent and they should be well bonded eyelids. The edge of the eyelids should be pigmented black. Almond-shaped.
Ears: Semicaídas or fallen forward ears covering the ear canal, of good texture and great mobility.
Cheeks: The muscles of the cheeks should be well developed.
Strong and clean allowing carry the head with balance.
Top line: Levelled. The length from the cross to the insertion of tail is slightly greater than the height at the cross.
Renal region: The kidney region must be short, strong and very muscular.
Chest: Chest deep to wide, with good clarity from the floor, allowing the chest to be halfway through the cross to the ground. The ribs should be well arched from the spine, flattening sideways so that the edge behind the elbows can be taken by two hands – approx. 40-43 cm.
Sternum: Point of the sternum clearly in front of the point of the shoulder.
You can download it at rest. Moving it must be erect and if the tip is cut off it should be at the same level as ears.
Scapulae: Well inclined and not very heavily muscular.
Front legs: Straight bone of the elbow at the foot, seen from front or side.
Humerus: Length and angle enough to ensure that the elbows are placed under the body.
Strong and muscular, balanced in proportion to the scapulae.
Knee: Well angled.
Metatarsals: Parallel when viewed from behind and the copy stands freely.
Paw: Close to the ground.
Round, strong, padded, not large, toes moderately arched, without turning inward or outward.
Effective, free and elastic.
It may be short, brittle or hard. It must be water resistant. The robes not must be altered (started) so that they appear as short or brittle.
White must predominate with black and/or fire (so) brands. Fire brands may vary from the Pale to the stronger (Brown).
SIZE AND WEIGHT:
Ideal height: 25 cm. (10 inch) to 30 cm. (12 inch).
Weight: The equivalent of 1 kg. weight for each 5 cm. in height.
Example: a dog 25 cm. must weigh approx. 5 kg. and a dog of 30 cm. should weigh 6 kg.
Any deviation from the above criteria is considered missing and the severity of it considers the degree of deviation to the standard and its impact on the health and welfare of the dog.
• Lack of true Terrier characteristics.
• Lack of balance, example: sobreangulación of any of the items.
• Heavy or little firm movement.
• Defective teeth.
Any dog showing clear signs of physical abnormalities or behavior should be disqualified.
Males should be two appear normal testicles fully descended into the scrotum.