I thought we had finally found a toy for our 3 yr old Pitt/Boxer. Unfortunately after a couple hours of chewing, he got to the point where he was ripping large chunks off that posed a chocking hazard and we had to take it away. I don't thinkthe Zogoflex toys are quite as strong as the Kong Extreme brand, as that still seems to be the only thing that holds up for more than a few hours.