Are you still having the problem my friend? For God's sake feed them, tamed animals only regenerate their health when fed as of this update, it is no longer like how it used to back then when your animals keeps on getting the regen effect even when hungry.

And Lox's been nerved. Still strong for a single one vs one fight, can even beat Eikhtyr solo, but Lox can no longer fight is prolonged time with multiple waves of enemies.
Yes, no more One Man Army Lox, hence why i breed couple of them and with 5 Lox in the vicinity, they can keep each other from harm.