Cats

Cats also called sometimes thanes of Tevildo were cats under Melko's spell, acting as his and Tevildo's servants in Beren and Lúthien.

Beren and Lúthien (2017)
Cats or thanes of Tevildo obeyed Tevildo the Prince of Cats, mightiest of cats, possessed by an evil spirit and a follower of Melko the dark lord of Angband.

After Tevildo's defeat, he is forced to yield his collar to Lúthien and reveals the spell to release the enthralled Cats, who are then freed and afterwards the Servant of Melko flees in order to escape his master's wrath or scorn.