I got Maggie when Buster was 11 months old as I thought he needed a "friend". It is now a year later and things have not gotten much better. I thought Maggie would settle down after a few months. She takes over the food, the toys, etc. She will bite Buster's legs & ears, she will sit at the top or bottom of the stairs and not let him pass. She will sit in front of the doggie door and not let him in. She can be very sweet. She is very good natured when it comes to getting a bath or brushing her teeth, getting medicine, etc. Buster throws a fit at any of those things. They are both very spoiled and it's my fault. I love them both and will not give up either of them. So, even if you get one of the opposite sex it can still work against you. But I am glad I have two.