So Tipper and I are in our 3rd week of obedience training and it's going GREAT. She really turned on last week and seemed to figure out the clicker as well as the fact that I have delicious treats to give. At home she is also doing great but she also gets overstimulated in about half a second. Tennis balls, the word outside, tug toys, me not doing whatever it is she decides I should be, all result in a flurry of high pitched horribly annoying barking. We are finally to the point that I can pick up a tennis ball and throw it without her barking. My question is how to fix her threshold level when she reaches it in .2 seconds? I try to be calm and quiet walking to the door to let her out but as soon as I wait for her to wait at the door she commences barking. Or if she figures out I'm heading for the door she will start barking immediately. Also, she's very mouthy when she gets excited. She will put my entire arm in her mouth and while she doesn't clamp down she does scrape her teeth over skin and it's not exactly comfortable. So far I've been yelping like it really hurts and she will stop but she will do the exact same thing five minutes later. Help?