Wow, 6 weeks is a very young age! What is your breeder's kennel name? Here are some ideas:

*Kennel*'s Dark Horse
*Kennel*'s Western Fantasy
*Kennel*'s Riding Dirty (I don't mean like that, you sickos!!! )
*Kennel*'s Rough Rider
*Kennel*'s Cowboy PUp

Another one that has nothing to do with your theme:
*Kennel*'s Dulce de Leche