How about a Kong a Buster Cube or a ball to retrieve? They also have toys that record your voice, so when it's moved they hear you talking. My Doxie isn't interested in any toys except her 'stuffed' Kong when we leave for errands. Be sure not to get anything that she or he can tear apart and swallow. Always supervise when you give toys.
I occasionally give C.E.T. Chews. You can purchase these from your vet they is suppose to be good to help keep their teeth clean. But than again only give them when you are present.
DO NOT give her/him Greenies!!!! They can cause a blockage. JMHO