We used to have a Malamute mix (looked like he was mixed with a LARGE wolf). This was a big dog. We had a harness made for him and he used to pull the formula ford all over the place. Driver, fuel and all. Uphills, he didn't care. He loved it! His name was Cujo. Many people kept his distance.
Don't call him Carroll or Shelby for that matter, that is cruel!
Rick