Work on teaching her to Drop it. Labs and goldens generally are bred to have “soft mouths”, but are also very oral. Don’t get in a tug of war with her with anything other than one of her toys. IMO drop it is one of the most valuable commands to teach a dog - whether it has something of yours in its mouth, or you see it pick something up outside. Make her drop it, and then you can figure out what it is and if it is okay for her to have it in her mouth.
Have you firmly established your dominance over Sophie? (Cool name, BTW!) Here’s something that worked for me. Say Sophie has a sock. You tell her to drop it. If she refuses, DO NOT grab the sock. She will think you want to play that fun tug-of-war game. Instead
-get ahold of her collar.
-get down to her level (tho slightly higher)
-look right in her eyes
-repeat the command in a low, serious, almost growling tone while just putting a little pressure on the sock. Don’t pull on the sock, but instead, put your finger between her teeth BEHIND the sock, and essentially push it out. This would also be a time to add in any command of emphasis you use, such as NOW.
If she still doesn’t drop it, you can emphasize a couple of different ways. Repeat the command while you
-tap the side of her snout with one finger.
-what seemed to really work for me is to open your mouth and actually place it over the end of her snout. Ever see dogs do this to each other when establishing dominance? Don’t bite her or anything. Make it so she’s just basically breathing your exhalation. I would be surprised if she failed to drop the item then.
-another dominance ploy is to lift her so both front legs leave the ground.
If any of these lead her to drop the object, lavish her with effusive praise, give her a treat, hugs and kisses, play tug of was with her chewy toy, whatever.
Then repeat a jillion or 2 times as necessary.
My other mandatory commands are No and Move. Course, that’s just how I like my dogs to behave. With No, the dog stops whatever it is doing, whether it is jumping on a visitor, chewing a sock, or taking a whizz. Move just means go somewhere other than where you are. You can get fancy and work on other room if you like. Also Come here and an all purpose emphasizer like Right now!
Sit and Stay are also, good, but less useful in how I am with dogs. Add in Quiet, and that’s about all I ask of a dog. Mrs D and the kids add in bullshit like Kisses, and Roll over. Oh yeah. Daisy brings in the paper, too.
How much do you work her? Every day? For how long? I’m not trying to suggest you aren’t doing it right. I’m just asking. It doesn’t come easy. Just the 7 or so commands I mention, to get the dog to follow all of them faithfully, and walk well on a leash, takes a hell of a lot of work. Also consistency by all members of your family.
Another thing to do is to get her used to you doing basically whatever you want with her body. If you want to open her jaws at any time, you should be able to. You should be able to palpate the pads on her paws, check out her ears and butt, and she should accept that as your prerogative. Again, lavish praise when she cooperates. Your vet will thank you. And it really comes in handy should Sophie ever injure herself and you are trying to diagnose/treat in an emergency. So once a day or so, make her lie down and check out her ears, eyes, teeth, feet, etc. See, my last few dogs would love to play tug of war with them, but if I ever put my hands on their jaws to open them, you’d better believe they’d open up! It was just never a question. It never crossed my mind that they had a choice, and I believe as a result, they accepted that they did not have a choice.
Don’t second guess the breed. I’ve known some labs that were holy terors - in fact, overall the labs I have known have caused more chewing damage for longer periods than the goldens. But that is just my limited experience.
Wish I could have been of more help.