i've had 2 that never yapped, maloneys roxy never yapped, her litter sis tina never yapped her litter bro tiger never yapped and her other bro sam never yapped, me mate has a tool of a dog out of him that dont yap, mate has a bitch out of him to a smokey dancer bitch that dont yap...........old judy gave odd yips when she wasn't fit and me mates bitch give odd yap when not fit so 2 from all them isn't bad...........maybe the ones you seen were off bad stocksman