The led cows, hastily brought in and tethered to anything that would hold them, were looking stupidly on, or lying down chewing the cud of nothing particularly repaying their trouble, which they had picked up in their interrupted saunter.
There are no more uses of "tether" in the book.
Show samples from other sources
My body dangles, tethered by a rope hooked to my belt.
Sabaa Tahir -- An Ember in the Ashes
Most of the others sat slumped and sleeping in wheelchairs lined up in front of a huge television screen, all tethered to oxygen tanks like withered balloons.
Laurie Halse Anderson -- The Impossible Knife of Memory