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Panting can be a symptom of a heart/lung problem, particularly if the dog is not on heartworm prevention. It can also be an indciator of pain. It can also be something as simple as the dog cooling himself. Keep in mind that they can't sweat so they cool themselves by panting.
I suggest that you keep an eye on him tonight and see the vet tomorrow if it does not resolve itself.
Let me know if you have questions.
A normal temp is 101 - 102.5 so this is ok.
Thanks for accepting my answer!