I have no real issue with ranchers protecting their livestock from coyotes. Stringing them up on the fence doesn't deter other coyotes. Not sure the point of it. Here are a couple I have run across, one being the biggest coyote I have ever seen. Maybe a coydog?
Regarding stray and dumped dogs, it is a really big problem in Houston. No secret I spend a lot of time in Houston's rougher neighborhoods doing photography. I see so many dogs. Strays, dumped, dead and dumped (some bait dogs, others fighers that lost). It is sickening. I have helped rescue several of them. A couple of them were flea infested or mangy. Got them homed though. Just look at these terrifying monsters.
This is the last one I helped. Beautiful bully breed. Still had a 10 foot chain attached to its neck. It wouldn't let me get close enough to remove it, was scared to death. I left him some food while the rescue group came to get him. I couldn't stick around, hope they got him.
People are so fucked up. It is shocking so many people aren't self aware enough to recognize they can not or should not own a dog (or have kids). As bad as I feel for these dogs, canines will likely out last the human race.