Taylor CJ, Simon BT, Stanley BJ, et al. Norwich terriers possess a greater vertebral heart scale than the canine reference value. Vet Radiol Ultrasound. 2020;61:10‐15.

The abstract is available here. This article is not published “open access”. It is available online for a small fee and accessible through a library.

Previous studies have demonstrated evidence that normal reference ranges for radiographic vertebral heart scale values can vary among dog breeds. The purpose of this retrospective, observational study was to determine whether the normal vertebral heart scale values published by Buchanan and Bücheler for lateral radiographs are applicable to the Norwich terrier. Secondary objectives were to determine if clinical signs of respiratory disease, age, sex, weight, body condition score, recumbency, or thoracic depth-to-width ratio had any influence on vertebral heart scale measurements in this breed. The electronic medical record systems of two universities were reviewed and Norwich terriers were included in the study if they had orthogonal thoracic radiographs performed and no historical or radiographic evidence of cardiopulmonary disease. A vertebral heart scale was calculated for each patient. Sixty-one client-owned, Norwich terrier dogs with no clinical signs of cardiovascular disease were evaluated.

The vertebral heart scale for Norwich terriers without evidence of cardiac disease (10.6 ± 0.6) was found to be significantly greater than the canine reference value of 9.7 ± 0.5 initially established by Buchanan and Bücheler. No significant correlation was found between clinical signs of respiratory disease, sex, age, thoracic depth-to-width ratio or lateral recumbency, and vertebral heart scale. Norwich terriers with a body condition score ≥6 had a significantly higher vertebral heart scale than those with a body condition score ≤5. Breed-specific ranges and body condition scores need to be considered when interpreting vertebral heart scale values for Norwich terriers.

What is the Body Condition Score?

2014, AKC CHF “Understanding Canine Epilepsy”

Paroxysmal Dyskinesia in Norwich Terrier Dogs. Luisa De Risio DVM, MRCVS, PhD, Dipl ECVN Oliver P. Forman PhD Cathryn S. Mellersh PhD Julia Freeman BSc. First published: 19 May 2016 https://doi.org/10.1002/mdc3.12334

2014, Bruce Eilts (Society for Theriogenology). K9 Breeding Management. Contains some useful charts about progesterone concentrations and day of cycle relative to LH peak, and other topics of interest to breeders. Recommended by Susan Miller Hall.