People who played Skyrim I have some question?

Can I have a husky without joining the vampire hunters in Dawnstar? Are the husky immortal?

How often dragons and vampire attacks in towns? I haven't do the quest in Whiterun where you need to talk to the yarl about the dragon. So I'm safe from the dragon attacks and my character is not yet prepared.

Can you survive skyrim without maximizing smithing, alchemy and enchantment?