The thing I've heard is good is to soak a dishtowel - or in a little dog's case a washcloth - in chicken broth and freeze that - that way, it's not only cold and soothing, but also tasty!

That, and of course, hide all shoes! One pup my family had chewed ONE each of every pair of shoes I had - I accidentally left the closet door open just enough for her to wedge her nose in ... she didn't seem to have a preference for left or right, but once she'd chewed one shoe of a pair, she left the other alone. Sigh.