FIGURE 1.

Four generation pedigree of NRE colony dogs. Dogs marked with a “?” are purebred Papillons in which we do not know the phenotype. A dominant mode of inheritance is suggested from the breedings in which two affected male Papillons (III‐F and III‐H) were bred to three different female beagles (III‐D, III‐E, III‐G) and between the four litters produced six puppies had the NRE phenotype (IV‐J, K, P, Q, R and S) and eight puppies had normal ERGs