Harder than Bibiana the Bunny
My 10-week old Papillon enjoys playing with and chewing on Tristan's different surfaces. I purchased Bibiana as another chew toy for her, but Bibiana only lasted for a few days before my pup was close to chewing chunks of her feet off. Tristan's plastic is harder than Bibiana's, and at most my pup's teeth have left scratches on his plastic surfaces. If you are choosing between the two, I would recommend buying Tristan.