“Dog that barks, doesn't bite.”

It indicates that people who often make a lot of noise or threats are usually don't act on them.

Translation in spanish

“Perro que ladra, no muerde.”

Indica que las personas que hacen mucho ruido o amenazas suelen nunca perseguirlas.

Phonetic:
/Pehr-roh keh lah-drah, noh mwher-deh/