Dogs are welcome all over Marin, and Fairfax is no exception.
Whay type of running do you like?
There is multi-use path that allows you to run from Fairfax into Sausalito and over the GG Bridge. There is also a virtually endless network of trails if trail running or hiking is your thing. There is a strong outdoor community in Farirfax, and some great bars and restaurants to finish off the workout.