Unless you can catch her EVERY SINGLE TIME she gets a pair of underwear to redirect her, there isn’t really a way to stop it. Chewing on undies is obviously pretty rewarding to her, or she wouldn’t be doing it. What is it that she finds rewarding?
- Do they smell like her humans? Consider making her toys out of old socks or t-shirts.
- Because she gets attention when she chews them? She might just be bored. Consider playing games with her.
- Because she is a dog and dogs chew things? Keep your things away from her.
(Obligatory reminder that dogs do not have the capacity to feel guilt. The guilty look is actually just a response to your angry/intimidating body language or tone of voice. Assigning the feeling of guilt to a dog is anthropomorphism.)
If nothing else works, tell your dog the internet thinks she’s gross for eating undies. I sometimes try to peer pressure my dog into doing things. It rarely works. – C