I can't really say much to this question. You just stand there until you are getting too low on hp or until the monster dies. A lot of beastlords like to sit back and just let their pet do all the fighting, but I hate that. Defeats the purpose of being able to tank by yourself. If you bind wounds it's easier to self heal than waste mana on your pet anyways, so that's probably your best bet.
Get better armor and keep defensive skills up. Remember that you aren't a warrior, and will take damage tanking. Of course, it might also be relevent to know your level, but this advice is pretty sound for most beastlords below level 50.