I would also recommend whimzees - I had lots of trouble getting Cadmium to chew toys, she's not a big chewer, but she does enjoy a whimzee
I have the toothbrush ones and it's adorable watching her carrying it around, there currently appears to be a rule that the whimzee lives in the nest, or at least in the chamber house her nest is under. Just in case the nefarious hoomin tries to steal it?