My guy is just wild for zany balls, it is his go to toy. Its made of soft latex and fits perfectly in his mouth. I can't give opinions about the Bark box, I ever got involved with that. There are some members that may be able to offer up their experance with Bark Box
Zany balls can be purchased on Amazon
https://www.amazon.com/Zanies-Latex-...ps%2C67&sr=8-6