expression, noun
jealous complaint; the loud bark of a talentless dog
Idiomatic expression meaning that incompetent people tend to complain loudly or criticize others out of jealousy. The literal image is of a talentless dog barking loudly.
彼の批判は能無し犬の高吠えに過ぎない。
His criticism is nothing more than the loud bark of a talentless dog.
あの人の文句はいつも能無し犬の高吠えだ。
That person's complaints are always just jealous barking.
The exact origin is uncertain, but it is a proverbial expression comparing the loud barking of an untalented dog to the envious complaints of an incompetent person.