Hopefully she will outgrow it. Juju is under 3 pouunds and has no probs. with any dogs. Uma at 4 and a half scares the bejeezes out of me she is so aggressive to the larger dogs. The man with the very large mix had the mix laying down, and Uma was so spastic I could barely control her! She triples her pulling capabilities she gets so worked up. Finally the big dog could not handle it any more and lunged up. The owner quickly got him under control and reprimended him, meanwhile Uma is STILL going nuts and wanting to take him on. Juju is just calmly watching all of this as if it is a program on TV!!! Finally I picked her up, as it was very clear she was NOT going to calm down. I told the man that I thought my puppy was going to end up aggressive,and he agreed. Oh I hope not! This attitude could get her killed. It does make me feel better to know she is not the only one with this problem..