Hi Guys, I have really enjoyed reading this topic so far.

I think opening on trail comes in 2 forms;
1. frustration on keeping up on high prey driven slower dogs like some pitts and bullys.
2. excitement on scent like the hounds you guys speak of and some pointers I have owned.

I believe it is both a learnt and generic trait but in saying that its easier to teach em to be open than have a open dog shut its mouth.

I like my dog silent and I would never get a pup from a known open dog or gyp.