I never actually saw this live-action colored movie but I remember seeing a trailer of it on Cartoon Network once a few years ago somewhere in the 2000’s. It was live-action. From what I remember, one minute, a boy sees and says: “Hello, Fox.” to a fox he comes across in the woods and then, the next minute, when the boy’s back is turned to continue walking, the fox suddenly replies with a rough/raspy voice and somewhat malicious grin on his face: “Hello, boy.” that suddenly shocks the boy.
Note: It is NEITHER The Little Prince, Narnia, Robin Hood, Dr. Dolittle franchise, Bridge to Terrabithia, Brer Rabbit, The Fox and the Hound 1 and 2, Fantastic Mr. Fox, Pinocchio, Rudolph the Red-Nosed Reindeer, Chicken Little, nor Zootopia/Zootropolis.
https://youtu.be/4L2ooG_MX9E
Long shot for what you’ve described but I remember them showing this fox in a trailer for Antichrist .
Sorry. That’s not it. Furthermore, I said it was a boy, not a man. And the fox was not some wounded animal with a demon voice.