Hi, Dotty is a very lovable girl; always wanting kisses and cuddles, but she has turned very barky and vocal at EVERYTHING. She has also started really nipping again and jumps up all the time. She is a nightmare when anyone visits and nearly knocks them over with enthusiasm. She jumps all the time when she wants something barking etc. Any tips? How can I tell if she is being aggressive or it is just her age? She hasn't been spayed.