ORIGINAL: Howler

If ya can't postively ID the target, don't shoot! From your discription, it sounds like you guys have some doubts about what you shot!!
BUT to your question, coyotes can make a lot of differant sounds, many of which some people can't tell the difference betweem domestic dog and coyote. So, yes it's possible that a wounded coyote can make sounds that sound like a dog!