Theres a bug in the game where your horse's speed and jump height will change randomly. It always seems to happen when you log off and then log back in after a little while. This bug is especially annoying when you spend a lot of time trying to get a really good horse only for the game to make its stats worse for no reason.
Poor horsey is tired
Yes this happens to me to it's quite annoying and should be fixed.
sometimes my tamed animals are stuck in specific spawns.
One of my best horses was stuck at 50:-100 and some of my wolves are in a a spawn near 0:0 with snow idk which one