As a puppy Gus the schnauzer loved the cross stitch threads that I cut off the back of my projects... I think the oils from my hands made them irresistible for him. They were tiny snippets so I didn't worry too much... until he found a thread with a needle still attached. His x-rays showed the needle (thread still attached as we found out later) stuck crossways across his lower bowel. $1000.00 later Gus came home. It went the whole way through his system and a scant three inches short!!
Luckily he is over that fetish and Finn his Sheltie brother just chews expensive shoes.