Hello. I'm Joe from Arkansas. I'm new to the forum and excited to be here. We have a 6 year old Shih Tzu named Lucy and have had her since she was 2 years old. She's the best dog we have ever owned as she is calm and sweet and likes to sleep most of the time. She is trouble free. She is also the smaller size of this breed at around 10 pounds. About 6 months ago, we brought another female Shih Tzu named Izzy into our home hoping it would give her a buddy but it's been quite the opposite. This Shih Tzu is only a year old but almost twice her size. It constantly smells of her rear and ALWAYS picks on her til they are pawing at each other and fighting. They often fight over the dog bed (it's plenty big enough for both of them) but it's obviously a territorial thing. Even though Izzy is also a Shih Tzu, you wouldn't ever know it other than her looks. She has a totally different personality than Lucy. She constantly jumps up on us while we are walking around in the house and it's quite annoying as her claws are sharp. My biggest question here is, is there a chance Izzy will ever be the calm natured dog Lucy is? She's already over a year old but hasn't calmed down much. Thanks in advance for any info.