Make sure the hook is going all the way down. Some clasps will only close completely in one direction. In other words, take out the hook, turn it 180 and insert back into clasp. It should slide and click shut.
I would get the vet to check the puppy for cheyletiella, (a mite with the nickname "walking dandruff".) This mite looks like dandruff and causes extreme itchiness.
If you are using Windows 10 (the OS used for this article), right-click the file and select "Open With". Select "Choose another app"; Notepad should be on that list.
You could either cut those threads and glue them to the back of the bangle, or you could glue them to the outside of bangle and place an embellishment over...