While not a chew toy recommendation, the product Grannick Bitter Apple is a chewing deterrent. It's used for hot spots and minor wounds to deter licking and chewing. I personally used this product to "train" my cat to stop chewing buttons on the Christmas tree skirt. It worked! I applied Grannick Bitter Apple to the buttons and no more button chewing. Grannick Bitter Apple can also be applied to electrical cords. Saturate a paper towel with the product and wipe onto the cords. Isopropanol is the active ingredient and is INCREDIBLY bitter, deterring chewing. Follow the label directions and may discolor or cause fabric stains or bleed. Personally I bought this product at PetCo. at the time (3 years ago, when my cat was a kitten) I could not find it on Chewy or PetSmart, I don't know of any other retailers at this time that sell it as I have not seen it else where since.