Hi I am new here and need some help. We have a 10 month old American Pit Bull Terrier that we have raised from a pup. We have taken him to three sessions of trainings as Petco and he has learned very quickly. We have four kids ages 12 to 19 in our house and we home school so we are home all the time. We also have a standard poodle, a cat and other small animals that he doesn't have access to. My problem is that the last two to three months Ace has been acting very aggressive between the times of 3-5 pm. He is a perfect dog until then but during those times he gets very aggressive and will begin to jump up and try to bite us. He has recently attacked my 12 year old son twice without provocation and bitten him deeply on both arms. Why do you think he is doing this and what can I do about it? My son wants him gone but I am not sure he should be rehomed or could be.