Do dragons respawn

Dragon fights give you a dragon soul, and a bunch of dragon scales and bones. Dragon souls are used to unlock new shout after you've learned a word, whereas scales and bones are used to forge one of the best armor in the game, both light and heavy.

If you need none of these, you can try to run away from random dragon fight. But keep in mind that dragons are fast and will follow you for quite a while, so you should be prepared to take quite a bit of damages while running away. (Assuming they're breathing at you)

I recommend any mage follower, specifically, ice and fire mages. Here's why: There's nothing worse than a kiting dragon, it flies around and then gets you with its fire/ice breath then it lands 100 metres away and you have to run over and by the time you get to it, it flies off to kite you some more.

Mages have a nice distance attack that they'll use on a flying dragon and then they can attack from a distance when it lands.

Archers also have a distance attack but dragons have weaknesses to fire and ice... So go for mages.

There are a bunch of them throughout the game. Try Marcurio, J'zargo, Brelyna Maryon or Onmund.

For a full list of followers and where and how to get them, go here

Skyrim Followers UESP