5-6 week old male that Was given to me a day ago suddenly started sneezing and is now breathing somewhat laboredly and guppy-like. He doesn't seem to be lethargic, but there is clicking with most breaths that sounds consistent with other pneumonia videos that have been posted here. He weighs 37g and I have 500mg Cephalexin pills, but don't know what proper dosage should be. Please help! I really don't want to lose this baby, especially since he's supposed to go to another rehabber tomorrow.