I used to have a alsation/labrador x greyhound cross whippet/greyhound, she was a very smart dog, you know concentrate hard, looking at you trying to understand what you wanted her to do next.
The labrador character really shone through in her make up, so easy to train, i'd definately have another.
Mind you I think she would never have taken a fox, she had determination but was not a hard bitch.