Intruder Alert! Intruder Alert!
Symon wanted to play with my pin cushion - he knocked the pin cushion to the floor, but I noticed it right after that happened.
Whenever I am sewing, I try to keep a close eye on all my supplies, including discarded thread.
I lock up thread discards, to keep them away from Symon. Yes, cats love to play with string and thread, but it is dangerous if they swallow it, which they tend to do. Long ago, in Atlanta, when our cats were boarded for a holiday, Button threw up a length of thin gift wrapping ribbon, and the vet saved it to show us, to make the point that we need to keep things like that locked up and away from the cats. Ribbon, strings and thread can wind around their internal organs if they swallow it.
I keep my thread discards in a little paper box called an Orts Box. If you Google 'collapsible orts box tutorial' you can find tutorials for how to make one (here is a good one). When we moved to Seattle, someone at my first job gave me a copy of a magazine page with instructions for how to make one. I made this one, and have used it ever since. So, it's about 15 years old!
This is what it looks like collapsed.
I emptied the orts box and put the thread in a magazine page which I wrapped up with masking tape. This is how I throw away my used thread. When I tear down canvas, that produces a lot of threads that come off the edges, and I wrap them up like this, too (with a magazine page or sometimes just masking tape), so Symon won't dig through trash cans and pull out what he thinks is a toy. Even though Masking Tape Balls are toys for Symon, he has never mistaken a package like this for a toy. And I usually stuff them down so he won't see them (he usually doesn't dig through trash).
Sometimes Symon is a good boy ; )