A simple knot for attaching leashes with the ability to quickly remove them. The leash line inserted into the knot can slide under load, so a stop knot must be tied at the end of it - for example [Ashley’s Stopper](https://fishplanetapps.com/apps/fishing-knots/knot/knot-387). Another option is to tie a hook to the leash on each side, and insert the middle of the leash into this knot - this will make two leashes at once.