Mendelian trait/disorder: yes

Mode of inheritance: Autosomal Recessive

Considered a defect: yes

Key variant known: no

Species-specific name: CD

Species-specific description: As reported by Davidson et al. (2004), "The CD phenotype was determined by videofluoroscopy, and dogs were classified as affected if the upper esophageal sphincter (UES) did not open, if there were morphologic abnormalities of the UES, or if opening of the UES was delayed for > or = 6 videofluoroscopic frames (0.2 seconds) after closure of the epiglottis."