Nubia's favorite treat / chew toy is a big bone. Yep the real thing. I go to the butcher and ask for a couple of the large bones that still have some scraps of beef on them. I boil these and then she goes nuts with them! First she nibbles at the little bits of meat and then once the bone is licked clean she spends hours chewing away (the bone is big enough that there is no way she could actually bite any part off, just a good work out for her).
Oh and the bones are free. The butcher would discard them anyway so...
