This is one happy dog. If he was in pain, his ears would be back with his head bowed, his tail between his legs, and his hackles would be raised. He's instead very energetic, with his ears up and his tail wagging while down. He's very excited, but somewhat nervous. He's likely nervous because his new legs feel strange, and he has to learn to adjust his gait. But otherwise, he's as @anthracite said, as happy as can be.
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