What's the script for Custom model animations looping without Player or gear interaction?

I know how to animate custom model animations, but I haven't been able to figure out a script to make them play. Would anyone please help me? I need to make the script play and loop the animation while the player is in the game, and it just constantly does it. Please, It's been stumping for the longest time. ( If you still don't understand what I mean, let's say the player is in an horse stable and the horses' heads are sticking through their stable windows. The horses' head shakes side to side, ears flicker. And it just loops. The script that'll make it play? ) And if you could tell me where the script would go, I would be very grateful! Thanks!