Sources, scope
and uncertainty.
Every clinical statement points to a source. Original worksheets organize observations; they are not clinical instruments.
Checked November 12, 2026. A citation does not mean the organization endorses this site or PawLine.
VCA: Why Dogs Chase Their Tails
Veterinary client education, named veterinary authors. Physical and behavioral possibilities; veterinary assessment for new, increasing or injurious behavior.
VCA: Compulsive Disorders in Dogs
Veterinary behavior education. Physical differentials, disruption of routine, assessment and humane support. Not a diagnosis for an individual dog.
AAHA: Why do dogs chase their tails?
Published April 10, 2026. Veterinary association article with named author and behavior-professional interviews; warning signs and team care.
University of Bristol: Spinning Dog Project
University project description, undated. Examples of possible contexts, not proof of a cause in your dog. The project page is not a current recruitment recommendation.
Dogs Trust Dog School: Research results
Welfare-research summary, undated. Different measures gave different results. No claim that spinning always proves present stress.
AVSAB: Position statements
Professional association guidance. 2025 clarification supports the 2021 humane-training statement and reward-based methods. No trainer endorsement implied.
Where the sources differ
Some clinical education describes interruption and redirection, while the timing of attention can matter. This site does not turn those descriptions into a treatment protocol. A professional should tailor the approach. Dogs Trust's welfare summary also cautions against treating one repeated movement as proof of present stress: different measures did not all tell the same story.
What we added
The before/during/after worksheet, the fictional doorbell example and the distinction between measured, estimated and unknown duration are original communication aids. They have not been validated as diagnostic tools. We do not calculate a risk or severity score.
No clinical review claimed
The PawLine editorial team selected and checked these sources. No independent veterinarian has reviewed or endorsed this website. We do not award ourselves a clinical certification.