I will add that I have a lot of rabbits and squirrels around here, and a lot of exposed coax. I've never had any coax nibbled on as far as I know. I also have moles and a lot of buried coax, and I have no idea what those evil suckers have possibly done!
I did have a Beverage antenna along the top of my 142' back privacy fence and the squirrels chewed the hell out of it. They used the fence top as a safe highway across the yard, and the wire really cramped their style since it was right in their way.
I was a security system tech for a few years long ago and the only critter damage I had to repair was from squirrels in the attic once.
And my final tale comes from Ladislav, a guy I went to college with who came from Czechoslovakia. He was once a technician who serviced the electronic controls at natural gas pumping stations across that country. They farmed a lot of sunflower seeds there, and as the harvest progressed in the Fall, giant herds of mice were driven across the fields trying to escape the machinery. These waves of mice would overtake the pumping stations and get into everything, and they would eat almost all of the insulation off of the wiring in them!