Blindness and deafness: Double merle Aussies typically have eye defects and are at higher danger of becoming deaf.  Gi?m nguy c? tr? phát tri?n ch?m ngôn ng?. Ng?n ch?n d? t?t b?m sinh ?ng th?n kinh n?m xung quanh h? th?n kinh trung ??ng. Close Icon Critiques are shown in