We have had 2 GWP's, the first one, Bismarck was a fun loving, playful, gentle guy. He ran under a stock trailer and we lost him at just over a year old. The 2nd one, Brigadier, from the git go, was a moody vicious dog. He bit whenever he decided to, the vet refused to board him. After he badly bit a contractor here at the ranch,I put him down at 15 months. Who knows why the difference. We went back to Brittanies.