Labrador Etta and Aston, a Springer Spaniel, have undergone intensive training to become two of only 17 fire investigation dogs nationally.
They will be used when investigations in to fires that are thought to have been started deliberately are taking place.
Both dogs have their own fire kits with protective boots.
Aston’s handler John Willingham said: “I am looking forward to getting out to incidents and putting their training to good use.” The dogs could be in post for about eight years.