When pup ahd his sore paw and was wearing a buster collar most of the time he hardly (obviously) chewed anything. Since then though he has demolished a hairbrush wooden ahndle, a broom shank, endless bits of paper (which he swallows) and shoes, socks etc. We went through all this when he was very young and thought he'd almost grown out of it. We have tried pepper spray, other sprays fromt the pet shop, mustard, chilli etc - he just licks them off