We did a DNA test on our Dane mix Bella, they didn't ask for any information about her or a picture, it came back pretty much what we expected, so I believe they are pretty accurate now. We knew she was at very least half Great Dane and knew she had Collie somewhere in her background because of severe reactions to some medicines, we had a feeling she could have some Lab also. So results came back and she's 50% Great Dane, 25% Lab, 12.5% Collie, and 12.5% Golden Retriever. The only surprise to us was the Golden Retriever.
Maybe when he gets a little older we may decide to test Loki, for right now being we just got him (like 11 days ago) we want to make sure he's healthy, happy and to find out more about what we can expect of him being at least part pitbull.