FYI - for what it's worth - the NY DEC and/or biologists have claimed there are no "coy-dogs" on the premise that dogs and yotes won't/can't interbreed. They say they are simply wild dogs - which is possible, just like there are ferrile cats.

With that said, I beleive there are coy-dogs - I have seen some "funny" looking dogs in the woods that I wouldn't say was a domestic or a yote.
However, nothing I can state as FACT.