My dog is 8 months old and for some reason he has went into my step daughters room and has pooped, we don't know why he is doing this. Last year when she came to live with us we had a cat that for some reason was pooping and peeing on on her stuff and her bed. We are trying to figure out if maybe she is hurting them in some way. And another thing when she got a stick from the front yard and came into the back yard with it our dog came running into the house scared to death. I have had sticks in my hand and he has never done that. Please help me figure this out??

How old is your step-daughter? Their behavior can be from different causes dependent on whether she is 5 or 15.