We adopted Petie from the animal shelter last Sept so have had him less than a year. We do not know his age, sex, or background. My husband and I are retired and we have a lot of time to spend with Petie and his newly acquired housemate Norie - a young quaker we got from a rescue center in April. Petie has never bitten me - Norie is another story. She bites. We spend 6 months in FL, where it is just my husband and I. When we come home to Indiana in April, our grandkids come to visit from time to time. We did not have any trouble with Petie and the grandkids for the brief time they were around him before we left for FL, and no trouble on their first visit this spring, however Petie would fly over onto Oliver's head from time to time - only him - not his brother. On this past visit, Petie flew across the room and bit Oliver HARD on the ear!!!! May have bitten through - not sure. I am not aware of any incidents between them that would have caused Petie to do this. If it had been Norie, I would not have been so surprised. It will now be an ongoing problem, because I do not dare have Petie loose when the kids come to visit. Any ideas on why this happened?