while role playing is not aloud, there's a spell that claims you can create a dragon [been trying to get it removed, or at the least edited, for a while] you can't will a dragon into existence astrally or otherwise. you could meet a dragon, and you could have an astral dragon [no physical dragons exist] live in your home, but you can't create one, sometimes dragons just stops by to visit, so unless it tells you, don't assume your dragon will be with you forever. if you practice Dragon Magick, eventually you will have a guardian dragon [some people have more than one] who lives in your house and drives away unwanted beings. again, this creature is astral, and is about the size of a house cat. it's a young dragon, and you might not be able to see it.
if that spell does work, it's more of a call to dragons for one that the particular species you asked for. the reason only you can see it is because [as stated] it's astral, and you can probably see dragons. just like some people can see spirits and others can't, some can see dragons and others can't.