Answer:
for the theme or something else?
It would be the girls’ dogs since there are multiple owners of the dogs. You keep the girls plural and use the apostrophe at the end to make it girls’ since it is both plural and possessive.
I believe its an alto, those are the two groups female vocalists are usually divided into
(problem) I can't find my pen
(solution) ask someone to lend you one or retrace your day and look around for it.
I'm not sure if I answered this right but I tried