a lot of lads have beddy/whippet/grey types for example and the yapping is all to frequantly mentioned amongst them,only seen two work myself and both yappers,they cant all be shite dog men so must be a common trait from the beddy side,neither of the two i seen work was with terriers so no reason for them to pick up bad habbits both were lamping dogs,shear frustration,who knows but not for me,been put off by the whole idea of getting one