This is my truck on ebay
http://www.ebay.co.uk/itm/1992-TOYOTA-LANDCRUISER-VX-AUTO-RED-/120798266398?pt=Automobiles_UK&hash=item1c2023441e#ht_1092wt_1177
I agree no matter the x its usually going to be down to the owner entering to early or an unfit dog. But surely some are more likely to yap than others?
Surely lurcher's with a lot of terrier in the mix? my mate had a beddy whippet bitch that yapped although she was entered to early, she never grew out of it.