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The issue with DNA testing dogs is that there are different breeds within the same species and each of those breeds stems from the lines of other breeds so say for example the Doberman Pincher is made from rottweilers, greyhounds and german pinchers with some other breeds mixed in to refine the temperment and look. So if a dog was a doberman pincher mix, theoretically it could show a a rottweiler mix or a greyhound mix, because the genes from those breeds are also present. When a breeding occurs the DNA donated from both parents is combined and mixed up so accuracy is not guarenteed, espeically if there are many mixed being donated.
With humans they use DNA usually to try and match it to another DNA sample, which is very simple you just have to run the sample DNA and basically see if it lines up. The dog and human genome are not perfected so you can not take a peice of human DNA and be able to say it belonged to a 5'9 white male roughly 39 years old, and balding. I personally wouldn't bother with the dog DNA test there is too much variation within once species for it to be accurate enough and they are kind of expensive.
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