The dwarves were cheerful because they had finally taken their kingdom of the Lonely Mountain after the great dragon Smaug was defeated by the Lake men. Bilbo was unhappy because when he was back at the shire, he always wished to go back and see the dwarves of the Lonely Mountain and wander the paths of Mirkwood.
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The dwarves have found their treasure, which is what they came for, and for that they are very glad. But Bilbo just wants to be back in his hobbit-hole again!
They are happy because they like adventures. Bilbo is unhappy because he doesn't want to leave his peaceful life.
At the end of chapter 17 of The Hobbit, Bilbo is in the Battle of Five Armies and is just thinking that all hope is lost for the Dwarves and Elves and Men when he sees an army of eagles soaring toward them. Bilbo shouts, "The Eagles! The Eagles!" But then, a stone thrown by a goblin hits his head on the helm, and he falls down and blacks out.
He was not happy! He took off and attacked the dwarves on the Lonely Mountain and then stormed onto Lake Town and destroyed it, but was killed in the process.
According to the book the Tookish side of him was wearing off, and when he found them gone with a mess for him to clean up, he was relieved, although slightly disappointed, due to his Tookishness. However, when Gandalf forced him to come along without a hat or coat or kerchief, he was rather put out, and not at all happy with wearing Dwalin's oversized cloak and hood.
Because Thorin is the grandson of the King of below the Mountain (Thror). They are happy to see him and the other dwarves.
The Sackville-Bagginses never admit that they are envious of the Baggins family's wealth and status in the Shire. They also never admit that they are constantly scheming to acquire the Baggins' possessions or to undermine their reputation. Additionally, they never admit that they are motivated by greed and a sense of entitlement in their interactions with the Bagginses.