God made everything, including animals. In my view, our relationship to animals is like the distance between New York and Boston, whereas the distance between God and us is like the distance between Earth and the edge of infinity - yet God loves us. We should treat animals at least as well as God treats us.
God made animals capable for their own survival that they may reproduce. When men used the pit bull for their own advantage in the dog fighting sport, they cultivated the best fighting machine known to man. The dogs that exhibited favorable traits survived. Those that did not, did not survive. Survival of the fittess exploiting God’s perfect design of genetic adaption. These fighting machines through genetic adaption have a switch in their brain that cause these dogs to clamp down with their jaws and won’t let go even unto death. Once they bite down, their powerful muscles, developed though genetic selection, go into a shaking action that disconnects huge portions of body mass from their victim’s body. Few animals can perform this action as deadly as the pit bull. Even the most friendly, domesticated, pit bull has this capability and that trigger of death in their brain.