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Hello. Welcome to JustAnswer. I am Dr Z. I'm reviewing your question now, and will post back with a reply ASAP.
Does he pant when he is at rest but awake?
I would be less worried about it if he was recently examined and found healthy enough to be given a vaccine. Hopefully your vet listened to his heart during the exam to make sure there was no obvious heart murmur (which could indicate possible heart disease) or abnormal lung sounds. It is also less worrisome since he doesn't pant when he is awake unless he is exercising. Puppies can exhibit abnormally increased breathing patterns in their sleep as well as hiccups, but as long as it is not going on all day, when they are awake too, I wouldn't be too worried at this time unless other symptoms develop.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.
You are most welcome.