Why does my dog eat my underwear?

Honestly, if your dog is a bit of a crotch-sniffer then they could recognize the scent coming from your underwear.

Hello

This is a common situation. Your dog finds your scent comforting so your underwear is a good source of your scent.

You can:

Put your underwear away to the dog can't get to them Give toys/chews Some dogs will overgrow the behavior

I would recommend keeping a close eye on your dog after eating your underwear. Fabric is not good for their GI tract. Hopefully it will pass without seeing a vet. Normally a vet will do x rays and potentially surgery

Scent is a dog's communication. They tend to smell the crotch area, perhaps because it is in reach or the strongest scent closest to them. Underwear and socks are two common things dogs eat. Strong scent.

This is a scent based reaction. While it may seem gross or strange to us, dogs communicate and understand largely through scent. It is not uncommon for dogs to eat socks, underwear, or even sweaty gym clothes in particular- or to really thoroughly lick those items or roll on them. If you can find a hamper that has a latch on it, or even place something with a little bit of weight (but not something that would be dangerous if it fell) on the lid of your hamper, your dog will be less likely to be able to get to and ruin your undergarments.

Its all about the scent they smell with their powerful noses and typically the crotch area is the place with the most "scent" whether you like it or not