Here is a quick & simple project that your kids might enjoy making. It's a Dog Pull Toy made out of fleece fabric. I grabbed a remnant of fleece I had on hand. You could also use an old fleece blanket.
Then I cut it into 3 equal strips using my rotary cutter & mat. Then you tie a knot on one end.
I held the end while my daughter braided. She's really good at braiding, so it took less than 5 minutes to make. Finish off by tying a knot in the other end.
Our dog loved it, although I had a hard time getting a decent picture because he was moving around so much. Cracks me up to see how he's the same color as our flooring!
You could adjust the width & length depending on the size of your dog. You could make several to donate to a local dog shelter.