I have a Springer as well, they are awesome dogs. Mine chewed quite a bit when he was young as well.
2 things I would suggest.
Start crate training the dog. Buy a nice comfortable crate that is big enough for her, and when you're not there she goes in. give her toys to play with while she's in there. raw hide chew bones are great.
Second thing is exercise. Springer spaniels need lots of it. Take her swimming, or throw the ball for her. You get that dog tired enough, she won't want to chew as much.
good luck!
Yep, start crate training her. Make the crate a happy place so that she does not think she is being punished when being sent to the crate. Like Hillbilly said, lots of toys and chews.
I agree with the exercise as well. While we have Aussies (quite different dogs

),they are high energy like springers. They need jobs. Give her a job, even if it is chasing a ball. Try to find a hill and throw the ball down the hill and have her run back up it. Worked wonders for our sheltie.
Age has some to do with it, but at one year, she is still quite a bit of puppy. Give her time...she probably won't really grow up for another year to 18 months.
nfulton,
I believe with your dog especially a springer, she is chewing because you are not there. I have a German shorthair pointer who chews when I am gone. There is a term for it but cant remember or find it right now. She is obviously your dog, so she is mad your are not there at the moment giving her attention and also probablly has an excess of energy.
What I did with mine was scold her and then ignore her, pay no attention to her let her know your pissed. I also have a lot of toys for her and when I leave I give her a bone or chewie to take up the time. My pup is nine months old and has quit for the most part but still occasionally chews.
Dont know if this is any help to you but I think you can do this without a professional
I agree with this first statement in part. She is probably doing part of this out of worry...you are not there, oh my Dog, he has abandoned me...I must start chewing. It's anxiety. However, the fact that she is chewing only the items of your wife and child points to a pack problem. She views you as alpha, but does not have the same respect for you wife and child. Because of your scent, your stuff is off limits, but theirs is not. I don't know what kind of relationship they have with the dog, but it is something worth examining. Of course, you might just smell funny.
The biggest problem with scolding her is that she is doing it when you are not there. By the time you get around to telling her she has done bad, she has forgotten what it was for. It sometimes works to show the dog the item that pissed you off, but it takes a pretty perceptive dog for that one. I'm not sure that it would work for a springer...not familiar enough with the breed.
Your wife's and son's items can just be picked up and not left for the dog. The new furniture is a real problem. If it were me, I would start with crate training. I would also explore the relationship between the dog and your wife and son. If they catch her at it, what do they do? Putting her in her crate would be appropriate. As for professional help, you might have her evaluated to see if she is indeed suffering from separation anxiety. If so, it might be solved with some training, however, I have seen dogs that actually have to be on medication.
My Mate is a dog trainer, so I'll ask her if she has any other suggestions. Hope this helps.