Prevalence of tracheal collapse syndrome, congenital portosystemic shunts, or both in Yorkshire Terriers at one veterinary hospital.

CPSS and CTCS appear independent in Yorkshire Terriers; no protective interaction detected.

This cross-sectional study examined the prevalence of tracheal collapse syndrome (CTCS) and congenital portosystemic shunts (CPSS) in Yorkshire Terriers at a single veterinary institution. Medical records of 11,061 Yorkshire Terriers (7,263 with complete age data) were reviewed. The observed prevalence of CPSS was 0.8%, severe CTCS was 6.7%, and concurrent disease was 0.05%. Median age at diagnosis differed significantly: 2.7 years for CPSS versus 10.0 years for CTCS. The authors hypothesized that CPSS might influence CTCS development, predicting a lower-than-expected joint prevalence if such a relationship existed. However, observed age-specific joint prevalence rates aligned with expected rates calculated from individual prevalence values, suggesting no apparent protective or exacerbating effect of CPSS on CTCS development. The study is limited by its single-institution design and retrospective nature. The authors conclude that further investigation into potential genetic and physiologic interactions between these conditions is warranted to fully characterize their relationship in this breed.

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