@Elena17o717o Tread bobbin for a sewing machine. The spool of thread goes on top and this bobbin is located underneath the stitching arm. The top and bottom treads are weaved together.
And, thank goodness for that!
Human frequency can be wonderful, full of compassion and empathy. But, the flip side exists, too. Just when you need human support the most, you might get an unexpected, unpleasant reaction depending how the person’s day is going. Dogs are so consistent because they build their world around you.