I wouldn't go as far to say that they are all high strung. The white GSP that I used to have was very energetic and what I would call border line high strung. I say border line high strung b/c I've seen GSP's that were constantly spastic....around humans, wiggling around, always jumping up and down and against the pen. My white GSP was always 'energetic' b/c he always wanted to be out hunting....but he wasn't a nut case. When he was younger he was pace around his pen all day.....and I ran him and trained him every day. I think his energy was mostly due to his bloodlines. But when I let him intothe house he would be pretty calm and lay in the bean bag chair. However, the black GSP would prefer to lounge on the couch all day. About the only time he gets excited is when he sees the guns or hears his dog bell when I'm getting ready for a trip to the field. In all honesty, I can't say I've ever seen a GSP as calm and/or lazy as this black one.