somebody’s bark is worse than their bite
US /ˈsʌm.bə.diz bɑːrk ɪz wɜːrs ðæn ðer baɪt/
UK /ˈsʌm.bə.diz bɑːrk ɪz wɜːrs ðæn ðer baɪt/

1.
su ladrido es peor que su mordisco, no es tan fiero como lo pintan
used to say that someone is not as unpleasant as they seem or as their words suggest
:
•
Don't worry about the boss, his bark is worse than his bite.
No te preocupes por el jefe, su ladrido es peor que su mordisco.
•
My grandmother seems strict, but her bark is worse than her bite.
Mi abuela parece estricta, pero su ladrido es peor que su mordisco.