Help: my dog growls and barks at husband

Our rescue dog has lived with us for 5 months. He barks, growls, runs around and paces when my husband enters the house and when he comes to sit on the couch or get up from it. Then the dog comes over to get pets. He does this behavior primarily when I am in the house. He is already on anxiety meds. A behaviorist said our dog is fearful, and that he is not being protective of me. I want to help our dog, but my husband wants to return him. He is tired of a dog who doesn’t like him. Does anybody have any ideas how to reduce the fear and barking?