[咬人狗儿不露齿 / 咬人狗兒不露齒, yǎo rén gǒu r bù lù chǐ, ㄧㄠˇ ㄖㄣˊ ㄍㄡˇ ㄦ˙ ㄅㄨˋ ㄌㄨˋ ㄔˇ]the dog that bites does not show its fangs (俗语 saying); fig. You can't tell the really dangerous enemy from his external appearance.[Add to Longdo]
[のうなしいぬのたかぼえ, nounashiinunotakaboe](exp) (id) (obsc) a barking dog seldom bites (meaning those who make the most noise have the least talent)[Add to Longdo]