Dogs are also quadrupedal instead of bipedal reducing wear, have relatively low life spans compared to humans and tend to lounge about the house all day. Implants can go in and come out looking as fresh as the day they where manufactured. Hard pressed to get me to believe that's not Zimmer dog whistling.
Bal didnt work on dog related hip implants, he was designing a test model for in-vivo testing of femoral heads in dogs. Most of his work was stem cell coupled with TM.