While there may be no laws about ‘transporting it in the trunk of a car’, since our legislators can’t think up every possible inhumane thing someone could do to an animal, it would probably fall under ‘animal cruelty’ since it’s putting a live animal into an enclosed, non-ventilated trunk (a Malibu isn’t a station wagon) in the warmest part of the summer. Also, there ARE laws about keeping animals in cages, enclosures, carriers, etc, and the bare minimum is that the animal has to be able to stand up and turn around, neither of which an average-sized goat would have been able to do in that car trunk.
The point is, the goat was taken away from this woman because she was mistreating it.