Most people incorrectly use the terms dominant and dominance with regard to dogs. Here is a good blog post by Dr. Sophia Yin on the topic.
http://drsophiayin.com/blog/entry/dominance_in_dogs_is_not_a_personality_trait
I saw the DNA kit in an Orvis for Dogs catalogue (you can't spend more money for a dog than with Orvis!) and in at least one other as well. I'm sure you can find one via the internet! Good luck,.
Anne
