'Rock Dog' still exists
Good news, everyone! Rock Dog is not dead! It even has a release date, again, at least for China; July 8. The movie still doesn't have a North American release date yet (though IMDB has some further international dates); however, the movie is a Chinese/American co-production, and features a cast of Americans with an American director (Ash Brannon), so the plan has always been to release the movie in America, apparently. Eventually. Probably.
If it does get that American release date, it will be the fourth confirmed fully anthropomorphic animal world movie released here in 2016, counting (fellow Chinese/American co-production) Kung Fu Panda 3, Zootopia and Sing (with Spark and Sly Cooper bringing the possible total up to six, if they, like Rock Dog, could be bothered to get a release date out there).