what is going on out there

Yowling and howling, snarling and snapping Came in through a window when my husband was napping It sounded like a sound off, I was sure a cat would be dead. My own cat bounced in moments later, his fur stand-up red. What is going on out there? I asked, for now I heard low growls. The cats were ready to fight, as snappish as Turkish towels. Fred dove head-first under the bed and stayed until it was over. Rolling his eyes about it was my St Bernard named Rover.