Molly's sock eating resulted in two vacation incidents, now that I recall. The one was when she couldn't quite close the deal at the rest stop. The other was when she spit up a sock that must have been in there for weeks. GAck! In the motel room.
I will say that she'd had some symptoms. Not a loss of appetite but her GI tract had seemed just a little off for some weeks. Then suddenly, up it came and after that she was all better. But it was very subtle... I wasn't sure that I wasn't imagining until she chucked up that sock.
She was a perfect dog in every other way, but she would steal socks and pantyhose in a heartbeat and eat them whole. Once that started I had to get really careful about where my socks were. I had someone stay with me for a while that had an office job and we had to have a serious talk about pantyhose security measures.