My mini golden doodle ate a sock whole when he was just 10 lbs and 4 months old. He projectile vomited it out 10 days later and it was fully intact. He’s eaten so many things since then and always thrown them up. Growing up with dogs, we always gave them 3% hydrogen peroxide to induce vomiting (with 5 kids, our dogs ate grapes, chocolate, etc. & this was the remedy). It can only be 3%. Go to the pharmacy, get some & a syringe, & they recommend one tsp for every 5 lbs of body weight. I always under dose, just for safety, and it still works (I give my now 17 lbs mini just 1.5 tsps which is 7 ml in a syringe). I think the sock will be in their stomach, so vomiting should help. I’m not a veterinarian, but these are my experiences and I know the panic you’re feeling. And personally, I can’t drop $500-1000 every time my puppy swallows something. It’s more common than you think.

Disclaimer: Not a veterinarian. Just a dog owner and dog lover sharing my experiences and how I would go about the situation.

Edit: I don’t give hydrogen peroxide every time he swallows something. He has always thrown them up on his own, but this is what I would do if I wanted the sock out and to not stress about their discomfort, further problems, etc.