Poseidon would use this power on his love interests
One day he brought Theophane, the daughter of King Basalts, to the Isle of Crusmissa.
The suitors found out about this and so Poseidon turned Theophane into a snow white Ewe.
He also turned the Native Islanders into a herd of cattle.
When the Suiters got there and didn't find Theophan they were gonna make the Cattle their dinner, but Poseidon didn't want them to be cannibals so he turned them to wolves and let nature take its course.