If they're gone, this is late advise. If they're gone, I'm glad your problem was solved! If you want to try the natural route, spray the the floor and counters with this peppermint mixture. It also repels mice.
3/4 cup water
1/4 cup witch hazel or vodka
10 to 20 drops of peppermint oil (peppermint essential oil can be found in some grocery stores and almost all health food stores)
Put ingredients in a small spray bottle and shake before using.
This safe for people and pets, but a dog may not like the smell. It burns the noses of tiny animals, and actually kills the ants. Stronger oils must be used for cockroaches.