Can smaug see Bilbo with the ring on?

Smaug could smell him and he knew where he stood but never asked him about his invisibility. So, even if Smaug knew about the ring and his master, he was blind to the presence of the One Ring in the halls of Esgaroth.

Can the ring corrupt Smaug?

TL;DR: The Ring would’ve used Smaug’s greed to control him, making him raze Middle-Earth, and then corrupt him to such a point he wouldn’t be able defeat Sauron, giving the Dark Lord control over the land.

What happens when Bilbo returns to Smaug’s den?

Meanwhile, the dwarves and Bilbo huddle inside the secret passage, terrified. After a while, Smaug returns to his den and falls asleep. The hobbit works up the nerve to return to the dragon’s lair, only to discover that the dragon has been feigning sleep. The terrible creature is wide awake, and Smaug is waiting for Bilbo.

How does Bilbo react to the Dragon in The Hobbit?

Bilbo, falling under the dragon’s spell, is genuinely surprised to hear this, and wonders if the dwarves mean to cheat him. Nevertheless, he replies that he is confident in his friends, and turns the conversation to Smaug’s armor.

Why did the Dwarves send Bilbo down the tunnel twice?

Having been nearly killed in the dragon’s search, the Dwarves send Bilbo down the secret tunnel a second time. This time, Smaug senses Bilbo’s presence immediately, even though Bilbo had rendered himself invisible with the One Ring, and accused the Hobbit (correctly) of trying to steal from him.

What does Tolkien say about Smaug in The Hobbit?

Tolkien lightens the mood here with an amusing comparison between Smaug and a grumpy old man, though that comparison also emphasizes that Smaug is the embodiment of a bad host: he shares nothing with anyone. It’s also important that Bilbo can’t describe Smaug’s treasure—and nor can Tolkien.