For abuse to take place some kind of harm as to have occurred. What harm to animals do you see taking place in bestiality? From what I've gathered, the animals find it a far more positive than negative experience. As for consent, throughout history we've taken advantage of animals. Think the dogs in the Iditarod race prefer pulling their sleds through snow for hours on end rather than hunkering down in a warm cozy spot? Think oxen enjoy being yoked together to pull heavily laden wagons? Think dairy cows like being tethered by the neck inside barren stalls for years on end while forceably being made pregnant? Think horses like being saddled with heavy packs and made to make long treks through the wilderness? How about calves being slammed to the ground in calf roping contests? Or even aquarium fish kept confined to a ten-gallon fish tank. None of these animals were asked if they'd like to do these things.
I've no qualms with animals being utilized for food sources or for activities within their capability as long as they are well cared for. I do not condone the abuse or neglect of animals. I don't condone utilizing animals for sport, unless it's an activity that the animal has been bred for or is naturally inclined to. In all of the scenarios that you've mentioned above, I wouldn't condone abuse or pushing an animal beyond their capability.
Animals have been important to human livelihood since documented history often out of necessity.
In civilized society, sex amongst humans requires consent and that the participants be of legal age to partake. Animals cannot give consent. Humans can assume or construe consent, but, an animal still, cannot verbalize it and may not comprehend when a human being does intend to abuse or take with force. It's because of this that I liken an animal morseo to a human child than a human adult. Do we condone or legalize the sexual abuse of children because they may not outwardly oppose to it?
Most animals are not anatomically designed for sexual activity with humans. Even if an animal does not appear to be harmed, such activity may still yield negative physiological or psychological impact to animal or human.
In the 37 states where bestiality is illegal, if made legal, how does the government regulate what is and isn't acceptable? What parameters would be established to ensure that humans are not freely given the option to abuse?
Within our own species, too often, the victim sees no justice.