"Feanor and his sons abode seldom in one place for long, but travelled far and wide upon the confines of Valinor, going even to the borders of the Dark and the cold shores of the Outer Sea, seeking the unknown. Often they were guests in the halls of Aule; but Celegorm went rather to the house of Orome, and there he got great knowledge of birds and beasts, and all their tongues he knew."
(J.R.R. Tolkien "The Silmarillion")
I used some references to the horse and to the dog, but I dont remember, where found this.
I used the sketches that I made for the 3D book: [link]