Is there any way to look at pet enmity and them turning away from your focused foe?

I'd even be happy if they stayed locked on to whomever you are engaged with. It is quite possibly the way that I end up dying in some situations: my pet will go off immediately towards a different enemy if they sneeze on it. :{

Take for example the Tenzen fight. I will be up close and whacking away on Tenzen with my pet, then BOOM one of the tarus will land a spell and my pet will disappear to go hit them.