弱い犬ほどよく吠える

[Yowai-inu-hodo-yokuhoeru]:

Literal translation:

Weaker dogs bark more often.

The weaker a dog is, the more it barks.

Meaning:

An incompetent person tends to bluff and have a bossy attitude.

English proverbs similar to this proverb:

A barking dog never bites.

Barking dogs seldom bite.