I have a 5 month old boy Jax that I have had for 3 months and 3 days ago I got a 6 month old girl. I was nervous like you and went back and forth with it until I found the perfect girl for him. I am glad I did it (of course its only been 3 days
) Jax is already doing things that he has never done before like walking up stairs and getting on the couch alone. He is eating way more because he doesn't want Molly to have any! He is also using the bathroom outside instead of his puppy pads. But most of all he is so happy. He has been a bit jealous with my attention but not anything out of the ordinary. They wrestle all the time and I am happy he is happy. I actually got her for him instead of myself because I hate for him to be alone during the day. I say go for it! If you can afford her then do it. Your Oliver will be so happy!