We have had Maggie for a year and Buster still has not really warmed up to her. She is very dominant. She bites Busters ears and legs. Of course I have caught him biting her ears lately. She will sit in the house in front of the doggie door and not let him in. She will sit at either the top or bottom of the stairs and not let him pass. A lot like children. I don't know, I thought by now they would be better "siblings", at least "friends".
I dunno, I plan on having the trainers come in and work with her after the first of the year. Until then....