I have a 2yr old GSP and he has been around more dogs then I can count and get along great with other dogs. Went out with one of my hunting buddy this weekend to shoot some roosters and he brought along his new 5 month old lab to run with his 6yr old lab and my GPS to see how the big boys do it. When we were out in the field the two older dogs were so busy hunting they didn't pay much attention to the new pup. After walking we took a quick break and the little guy came running up to my GSP and before we knew what was going on he had the little guy down. He didn't hurt him at all thank goodness but he certainly did show him who was in charge. It really bothered me, he has never done anything like that before and at 2 still has a lot of puppy in him so I expected them to play not kick the little guys butt. Not giving up my dog or my hunting buddy so I need to figure out how to get him to not beat up the new pup again. Anyone have any ideas??