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I do this sort of thing for a living (not dog id but species ID) and I took a quick look at some of the DNA tests offered to see if I could figure out what they were looking at (gene wise) and was unable to determine that. I am assuming that the same rules apply for breed ID as species ID and you need a robust database of knowns in order to do a good job of identifying unknowns. I guess it all depends on if you have $60 to burn, I would consider it and the results a novelty myself. Can you find one that has all the possible breeds listed? And if you have a mutt that is more than simply a cross between two breeds (highly likely) and some of those are not represented in the baseline than the results really mean nothing.
Why does your vet think there is some Chow in there? From my limited experience one of the trademarks of a Chow is black gums and tongue, is that the case for your pup? Other than maybe getting a rough idea of size things such as a love for water etc you will discover over time and then does it really matter if it is because they are part newfie or part lab?
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