I have a ten week old Yorkie that I've had for two weeks and I'm having the most frustrating time training her! The first week at home she was catching on really quick to the litter box and would every so often go on her own. Now all of the sudden she refuses to go and when I place her in there she tries biting me and starts growling and then jumps out. I know she had to go but she refuses. Any suggestions would be wonderful!