Trena uses the UKC...makes no difference to me since i wasn't interested in breeding. I wasn't planning on registering any of mine...why pay the AKC money for something I didn't need. I have papers on all my girls but they just got filed away. Unless you are going to breed, it really doesn't matter IMO. I personally am more interested in the quality and health of the dog. I have known many AKC registered dogs that end up with Liver Shunt, LP as well as other major medical conditions. Those 3 letters do not necessarily mean good health as AKC will register any dog as long as it is accompanied by money. That's all they are really interested in. I had an issue with an "AKC" breeder in my area and she turned out to be a crook and scam artist. I reported her to the AKC and they basically told me they didn't care.

That's when i learned what those groups really care about...follow the money and you will find most of your answers.
Trena knows all her dogs and she is a good person. I wouldn't hesitate to get another pet from her. If you want to breed, then I wouldn't recommend her to you as hers are just for pets. If you are going to be a breeder, I would suggest that you contact some of the reputable breeders and find a mentor to help you with everything.
I have gotten my girls from Michigan, South Dakota and Texas (2 different breeders).
Best of luck finding your new furchild.