Castlehill is a breeder of mountain curs.
Good info on them can be found at the OMCBA. (original mountain cur breeders association) http://www.omcba.com/
Lots of mountain curs in Louisiana.
For what it's worth: Shock collars are for deer chasing dogs.
Deer have a very hot scent.
You need to be there and have a means of nipping it in the bud.
Most any dog that jumps a deer will chase it, until they have had some serious training.