Near Fairfield we have lots of them like that.....killed several trees by ringing them....
Same for me. Hogs will rub on the Pine Trees until they girdle it all the way around...then of course the tree dies.
Pines have a deep, rough bark...so they seem to prefer them, but will also use any of the hardwoods here with a rough bark (Ash, Shagbark Hickory, Osage, etc..).
Telephone poles and wooden fence posts that have been treated with Creosote get special attention too.