The 3 people were people who he wouldn't have had much interactions with before. The first time there was a lot of people around and he growled at sometime who went to pet him, they pulled back but then another person tried and he bit them. The second time he was tied up, which we rarely do but we were visiting parents for a family party and could not have him roaming. My brother went over to him and he bit him on the leg. Not sure what /if my brother did anything to provoke. The 3rd time we were visiting friends and he was playing in their garden, their 5 year old gave him a stick to play with. After a while he went to get the stick back from our dog who had left the stick near. He bit him on the arm. Each bite drew blood.