A foolish dog barks at a flying bird

Bad temper is its own safety valve. He who can bark does not bite.

Journalists are like dogs, when ever anything moves they begin to bark.

It is no use painting the foot of the tree white, the strength of the bark cries out from beneath the paint.

Many critics are like woodpeckers, who, instead of enjoying the fruit and shadow of a tree, hop incessantly around the trunk, pecking holes in the bark to discover some little worm or other.

Dogs, also, bark at what they do not know.