worms in the poo

i'm sorry i couldn't find a thread on worms.. so please forgive this post but i'm concerned. i don't remember much about worms. my brother has a boston and he said yesterday he noticed worms in her poo. how do dogs even get worms? she's an inside dog that lives in an apartment so i don't understand how she got them since she's only outside to potty.

i told him to take her to the vet ASAP & get her on some med's.