Pneumonia always leaves lesions on the lungs, only way to know exactly how much damage has been done would be
to have necropsy performed. That would really stunt his growth, but you could have him stuffed and then he'd be
totally safe for the kids to ride and play.
Otherwise too early to say, he may come out of it with little to no long term problems and will still be delicious
when the kids tire of him and want a pony, or a giraffe or an airplane. Perhaps he'll end up a lunger.
But it usually takes a relapse or two to do enough damage to make him a true lunger.
Didn't your vet recommend a follow up shot of nuflor on day 3?
Perhaps it was not bad enough to recommend... but I would... even though I would never over rule a vet that has
actually examined an animal verses making an online diagnosis.