Why do Targaryens have white hair?

Generations of compound inbreeding have preserved in the Targaryen bloodline the classic Valyrian features of silver-white (platinum blonde) hair, and very fair, pale skin. Allegedly, this also preserved in their bloodline the ability to successfully bond with and ride dragons.

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Who was the last Targaryen to have a dragon?

The last dragon belonging to House Targaryen died more than a century before Robert's Rebellion, during the reign of Aegon III Targaryen. Its death marked the extinction of dragons in Westeros and beyond until the birth of Daenerys Targaryen's dragons. And another question, why are targaryens immune to fire? TARGARYENS ARE NOT IMMUNE TO FIRE! The birth of Dany's dragons was unique, magical, wonderous, a miracle. She is called The Unburnt because she walked into the flames and lived. But her brother sure as hell wasn't immune to that molten gold."

Are dragons Intelligent got?

Dragons are fairly intelligent animals, and like a horse or a dog, they can be trained by their rider to respond to basic voice commands. Tyrion Lannister claims that dragons are intelligent, much more so than most people and will quickly recognize friend from foe. How intelligent is a dragon? In dragon lore most dragons are abov average intelligence and can even speak. Although the game of thrones dragons are actually the "cousin" of the dragons known as the wyvern a less intelligent version of the dragon and usually lack the ability to breathe fire.

People also ask why can't daenerys control her dragons?

She can't control her dragons because just like everything else, she expected this to fall in her lap too. She has largely bonded with Drogon. I am assuming her journey in the Dothraki Sea with Drogon would bring them closer and thus she will control Drogon better.