You can not put saddles and armor on horses, mules or donkeys in some devices.

This bug occurs only with some devices, as shown in the image. In creative or survival, you can not put saddles and armor on horses, mules or donkeys, it happens often.
Samsung galaxy J3.
voting link:
https://plus.google.com/106177668102817245490/posts/GGykbcvynXS