They think the dog is the Antichrist.
I can understand, because the dog has developed the habit of sneaking up behind the cats, pushing her muzzle under their hindquarters, and catapulting them into the air. They HATE it because it's an affront to their dignity, and when they hiss she just grins at them.
One of these days one is going to hear her coming and turn around and tattoo her nose for her . . .
What else are you supposed to do with cats?