A Southern California foothills community is on edge after a large dog vanished, leaving behind a trail of blood — fueling fears a mountain lion may have struck again just days are two other pets were torn to shreds nearby . The incident unfolded over the weekend in Oak Glen, where a resident told KTLA she believes her mastiff was attacked and carried off. The dog, she said, never returned home — something she described as highly unusual — and only a blood trail was found. The report comes as neighbors in San Bernardino County foothills says sightings of wildlife are nothing new — but recent incidents have heightened concern. Residents in the foothills fear a mountain lion may have struck again — just days after a previous pet attack. KTLA It comes just weeks after a husky and Anatolian shepherd were ripped apart in a separate attack.…