The tag implication #70684 felkin -> dragon is pending approval.
Reason: Was originally going to request this as felkin > furred_dragon, but I'm not 100% certain that's the right move. But felkin > dragon is a lot easier case to make.
Tagging is split to ~1.9k results for "felkin dragon" and ~1.1k results for "felkin -dragon" (63/36 split), so there's not exactly consensus when people are tagging things as to whether they should be considered dragons or not. But if you look at the wiki page, they're described as "dragon-like" and both of the example images used (https://e621.net/posts/622880 and https://e621.net/posts/603036) are tagged as "dragon" (and also furred_dragon but we don't have to go that far just yet if that's a reach). So it certainly suggests that felkin should be tagged as dragon by default. This implication would just bring it in line with that.