Ha ha I thought hmm if I was a kid I'd believe the costume was real and that there are real dragons walking around but the only thing that would spoil me believeing it to be real is the fact the dragons aren't flying... BUT pay attention to detail on that costume! The thing on toothless's tail is missing like in the film! And that explains why he can't fly 😂😂 now we just got to figure out that plasma blast and we will be golden on kids believing in dragons 👌
Make it. You need a frame, the body skeleton (mostly foam), the wings, and some mechanics to make the wings and tail move naturally. Just google search Toothless quadauit and there is a diagram. Don't think there are any how-to videos though. And then you need a lot of practice walking on all fours.
It's not a perfect likeness, but a perfect likness of an animated film dragon is pretty damn difficult. Gotta respect the effort that went into this. And the pain that walking on all fours for most of the day must cause.