By SARA VANDEN BERGE   It was a scary moment for a Morgan Mill family when one of their dogs was recently attacked by a rabid raccoon.   “A raccoon attacked one dog and two others (dogs) came in and killed the raccoon,” Erath County Sheriff Matt Coates told Beneath the Surface News .     The raccoon tested positive for rabies and the Texas Department of Health was notified of the positive rabies exposure in Erath County.   “The dogs have been tested and are being quarantined,