She is almost two. I got her at eight months. She's affectionate and loving, and seems very healthy. However at the start, she often bit my arm, kind of hard. I wanted her to stop, so every time she bit I would pick her up and put her on the floor; soon she stopped biting. But a friend said no, it's play biting, it's affection. However, when she bites it seems in anger or defense, and I don't think it's play biting at all. I think when I pet her rear end is when it happens, but then mostly, that part is fine. I am wondering about hidden pain; also what type of biting it is. She will jump away, turn, come back, bite my arm, and then oddly curl up on my lap. She seems angry... What do folks think?