Hmmmmm, I think the only thing that sets ours off is going outside! Teeka especially gets so excited and barks non stop till she gets out the door. We are trying to nip this in the bud as it is annoying and ear piercing! Although it is so cute to watch her run to greet her yorkie cousins. She can hardly wait until I open the door for her to run in the house and greet them all. She loves to play!