Circe in paintings

Why do so many English paintings of Circe in the mid-to-late 19th Century feature lions and wolves, not pigs, which is what Odysseus' crew were turned into? They seem more like tragic figures rather than femmes fatale.

Wright Barker mostly painted rural and sporting scenes - dogs, hunting, horses, cattle, landscapes - so the lions and wolves above are a bit more exotic for him. Maybe he never read the Odyssey, although certainly Circe may have had lions and wolves lying around. Perhaps he was influenced by John Collier in this even more ridiculous painting?

Or Edward Burne-Jones' earlier The Wine of Circe (1870) below.

There were precedents though. This is The Kingdom of Sorceress Circe by Angel Caroselli (c. 1630).