Normally gobblers and hens do not roost together in the fall. Hunting a gobbler in the fall is tough buisness, as they do not respond to calls very well and hardly ever gobble. Good luck.
The dog scattering the flock should have little effect as they will regroup. They may relocate their roost site if it was near dark.
They will generally roost close to the same area for a while depending on food and water.