Dude, a stegosaurus? I think this drawing was most likely the result of peyote.
Hmm ~ now where have we seen that before?
Amerind oral traditions describe the water panther as having a sawblade back, red fur, and a spiked tail, i.e. a stegosaur as the image shows. Try doing google searches on ‘dinosaur’ and ‘petroglyphs’. It’s a growing field of research.