I need help!! I have a 5 yr old yorkie, and her 3 yr old sister. Had them since they were 10 weeks old. Maggie, 5 yr old has been attacking Bailey, 3 yr old. Maggie weighs 10#s, Bailey weighs 4 #s. It started out about a year ago over toys, then treats, so I took away the toys and treats. Recently Maggie just goes after Bailey for no apparent reason and has been drawing blood. I'm at my wits end. My husband passed away 6 months ago, and I know she misses him, but she's always been my baby. Any suggestions would be greatly appreciated. Kathy