Sounds like a good dog. One of the dogs my buddy had was a rescued dog who was brought in to be put down because he got that inverted stomach thing that Danes can get. She saved him and got him surgery. His name was Spike...he was really intimidating looking. One summer she got the idea to get an invisible fence and it worked great for all her other dogs (she had like 12 or so dogs total) so she decided to try it on Spike. She put the collar on him and let go and he started trotting across the yard....once he realized he was free, he just kept going. Once he hit the fence, he let out a little help from the shock and kept on trotting along like nothing happened. It took all i had to run that dog down...he was so fast and wasn't even at a full speed run. Damn those long legs.
Yeah kinda cool when I used to walk him, i'd just turn and start running,...when he figured out what was happening, he started coming after me. It was like trying to out run a 460 w/ a 4 cylinder. Once he got going, he crossed ten yards in a second,... ran my ass down like a freight train.