Read this poem.
Worry makes an ache—
stomach swims, head throbs . . .
It’s an unwanted guest
with endless requests.
Like an empty piggy bank
Worry offers nothing.
Which line from the poem contains a metaphor?
Worry makes an ache—
stomach swims, head throbs . . .
It’s an unwanted guest
Like an empty piggy bank

I think it would be line 6

the answer is:  

he is voicing feelings shared by all humans regardless of race.

in paul laurence dunbar's poem "we wear the mask," he replicates the words mask and we to emphasize how people in general -not just black americans- hide their true feelings. he suggests the masks cover people's faces and eyes, which are the main parts that display their emotions. he also thinks people's pain conceal behind those masks, so that they cannot see reality and nobody is able to see one another's sorrow.

we should all just get dogs.