[quote=xAsunaWolfx]
Hm, Is a dog/ mini dragon companion/ Any animal really ...legit :)? i mean it makes sense to have a cat, avian (or bird species, or maybe a snake haha), I'm sorry, i didn't know if there's some unseen rule that goes to this xD
[/quote]

Traditionally, Hogwarts students are only allowed owls, cats or toads (all being animals associated with "witches" in the real world), but I'm sure exceptions, if they aren't too strange, could be made. Dragons, like Liriia said, are a no-no, as the only known dragons are all very large and not very friendly, but other, smaller creatures (other birds, like ravens or falcons or some such, perhaps, or small mammals like rats and rabbits, ala Scabbers) would probably be fine... Dogs... Hmm.

Dogs are very different from owls and cats, the two familiars that most people seem to choose, in that they are very self-sufficient, and generally hunt on their own. Toads, as well, are for the most part much smaller than dogs, and less obtrusive. In the absense of canon to refer to, this is a decision that should just be left up to the GMs. If they will let you have a dog, then you can.