Trophy?

I am a little confused, when do Enemies drop trophies? I know my wolf needs to be level 10. But i cannot seem to get any q.q So is it guaranteed and broken for me or is it just a chance for them to drop it and am i just unlucky?

It's a small chance for them to drop, and the enemy must be no more than 5 levels below your own. 

okkk ok thanks a bunch! thought i was just super unlucky XD but if it's a low chance thats bound to happen!