I am going to start kennel training my 7 year old female chihuahua. I bought her a kennel that isn't to big, but isn't too small. What tips and advice can you guys give me to help smooth this transition. I'm mainly going to be kenneling her when I leave or am not able to supervise her. She is very stubborn and I give into her really easy, which is going to change. Any help is appreciated!

Thanks,
Devin