Our Border Terrier ate a small leather treat bag I made for my wife to carry whilst walking him.
Obviously he ate that because it reeked of - and contained - treats. She'd dropped it somewhere, and she found the tattered remains of the cord used to close it. Otherwise, he eats or even sniffs at any of my leather stuff.
Was a tense time and he was x-rayed, which showed it was still in his stomach, so the vet induced vomiting.
Luckily all was well, and he recovered fine.