Originally Posted by wolfy dog
It sounds like the dog trusts your judgment and relies on you. When you are absent he seems insecure and shows these fear related behaviors because he doesn't get the leadership from your wife (?).
Also at nine months, he is going through some adolescent/puberty thing, enough to make ordinary things confusing to him. His hormones and his brain are developing at different rates, so he is over-reacting to normal stuff.
At core he seems like a well-balanced, sane, friendly dog with good nerve strenght. I wouldn't put too much stock into these incidents. I think it is great that your wife is getting more involved in his training - the more they work together, the more they'll mesh together.