My old yorkie used to think she was big and bad no one could even walk on the side walk across the street without her barking! She barked at dogs 4 times her size! Bear is probably trying to protect his teritory. Ktreva52 gave good advice, put bear in a crate and have Nikki around and then totally ignore them! Jojo and boxerlover Harley, my 7 month old cocker spaniel, you guys know her she acts big and bad too! she attacks my black lab who is way bigger then her!!!