Your dogs will love this great toy.
Check out these other great pet toys athttps://www.instructables.com/id/Y-SHAPED-DOG-TUG-TOSS-TOY/
Having trouble with the knot see my video instructable at https://www.instructables.com/id/BASIC-CROWN-KNOT-VIDEO/
Please discard if toy becomes damaged or torn. Not intended for children. Should be used for chewing & playing only. Supervision is recommended when dogs are playing with toys.