My other favorite enrichment item to purchase – nylon chew toys! One company even stepped it up and made an option that you can fill with food. Make sure you choose a nylon chew that is appropriate for your dog’s bite force; if they can take large chunks off it is not hard enough for your dog.
If you don’t have any nylabones, benebones, flavor-it bones, or the like you can spread wet food on a rubber toy and freeze it to make a similar fun toy to chew.
A link to the flavorit bone I mention: https://petqwerks.com/product/flavorit-barkbone-peanut-butter-flavor-infused/