The prosecution shouldn't definitively state what caused the injuries on JO's arm. They absolutely look like they could be dog bites, they also could be rolling around in glass, plastic, crawling through the bushes, dragged under a car, or any number of things and experts will never agree 100% what they are. We have no idea what he did after being hit by the car assuming you believe that is what happened. We have no idea if he died instantly or if those marks were on his arms before he exited KR's car (those could also be scratch marks from KR). To me, if there is no canine DNA on his shirt, then there was no dog bite. A dog bite through his shirt is much more aggressive than a cheek swab. Does anyone believe a dog dragged its teeth across his skin with his shirt in its mouth the whole time and there is no DNA left behind?