I would stick with Nylabones either the edible or the originals.
Greenies: Guaranteed Analysis
Crude Protein Minimum 52.0%
Crude Fat Minimum 5.0%
Crude Fiber Maximum 1.5%
Moisture Maximum 15.0%
Nylabone Edibles (Chicken): Guranteed Analysis
Min. crude protein: 1%,
Min. crude fat: .5%,
Max. crude fiber: 8%,
Max. moisture: 15%
Nylabone Original:
Has no nutritional values as it is just nylon and natural flavour
But I swear by Nylabone for any dog and for any chewer ratties. Also the company doesn't test on animals and has been making those TFH books for time out of mind.