Probably. I know many large breed dogs take 2-3 years to mature both mentally and physically (i.e. calm down). A few that come to mind are the Borzoi, Greyhound, Labrador, etc.

As for the off-lead issue, I'm very wary as to which dogs I allow off lead. Giselle is not off-lead unless she's in a fenced in area. With generations of breeding for speed and hunting ability, it wouldn't be too bright to let her off lead. Same goes for terriers. They're bred to chase and kill prey. That prey drive is very high and, well, they're not dogs with a super high drive to please you. Tobey's just being a little terrier!