Why not Spike?
Well, he is part pony (said by some dragons)(and dating a pony).
btw, side note: as I was making this vector, when I was like 2 layers from finishing this vector, inkscape crashed, and I lost everything that I worked on except 3 layers that I saved when I started. So did whole vector twice, and after that I found that lost vector (unfinished one), from moment when inkscape crashed. So I had 2 vectors of same screenshot (one finished, one almost finished).
MLP:FiM characters are property of Hasbro