Jack Russell Terrier: How should an owner handle adolescent behaviour changes?
When a young Jack Russell Terrier becomes less reliable, return to the last version of the behaviour that was working and rebuild from there. Watch Jack Russell Terrier's response closely and change one variable at a time. Return to easier cues, shorten sessions, increase reinforcement, and manage the environment while skills are rebuilt. Keep the easier version in the routine while reliability returns; do not test the hardest version every day.
What can change during adolescence
Jack Russell Terrier's official fci name is recorded as JACK RUSSELL TERRIER. Here, that matters because it is useful context, but the individual dog's response still decides the next step.
Rebuild the behaviour you want
- Return to easier cues, shorten sessions, increase reinforcement, and manage the environment while skills are rebuilt.
- Keep the official fci name in view (JACK RUSSELL TERRIER) and make the next step reversible, observable, and easy to stop.
- Keep the easier version in the routine while reliability returns; do not test the hardest version every day.
Arrange an assessment if
Escalate for sudden personality change, pain, disorientation, or aggression that cannot be safely managed.
References
Official FCI name: JACK RUSSELL TERRIER
FCI nomenclature page > breed name
FCI group: n°3 - Terriers
FCI nomenclature page > Group
Country of origin: GREAT BRITAIN
FCI nomenclature page > Country of origin of the breed
FCI standard date: 12/5/2012
FCI nomenclature page > English standard date
FCI standard PDF: https://www.fci.be/Nomenclature/Standards/345g03-en.pdf
FCI nomenclature page > English standard PDF link
Utilization: A good working Terrier with ability to go to ground. An excellent companion dog
FCI standard PDF page text > utilization
General appearance: Strong and muscular, balanced in proportion to the shoulder. Stifle (Knee): Well angulated. Hock joint: Low set. Metatarsus (Rear pastern ): Parallel when viewed from behind while in free standing position. Hind feet: Round, hard, padded, not large, toes moderately arched, turned neither in nor out
FCI standard PDF page text > general_appearance
Historical summary: The Jack Russell Terrier originated in England in the 1800’s due to the efforts of the Reverend John Russell. He developed a strain of Fox Terriers to suit his needs for a dog to run with his foxhounds and go to groun d to bolt the fox and other quarry from their dens. Two varieties evolved with basically similar Standards except for differences, mainly in…
FCI standard PDF page text > historical_summary
Gait: True, free and springy. COAT Hair: May be smooth, broken or St-FCI n°345- 05.12.2012 5
FCI standard PDF page text > gait
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