The cats haven't been eaten because the Coyotes arent hungry yet. they sit in Packs at night behind my house and have for 9 years, I have three small dogs and they have never been bothered. I am sorry about your dog as well, I can't imagine..but they were here before we were, along with the rats and raccoons and snakes(I had a 5 foot cotton mouth on my back fence, and a 5 foot rat snake in my garage) it comes with the territory. I contacted Tx parks and wildlife 3 years ago as there was a Feral dog that roamed during the day, he was never aggressive I don't know where he went, the others were determined to be Pure Bred Coyotes(could have changed but I doubt it). Regardless of what, why, where, when or how, they are going to get more agressive because they will feel trapped and cornered because we are encroaching on there space, it's nature(hit on the side of the road is not). They need to be re-located not killed.