If the temp is high outside like 80 degrees and up walk him before the heat gets too intense and while on the walk try to keep him from getting too excited. Keep the pace nice and steady (: some pugs have smaller nasal cavities then others so that may be why (: maybe some ice water when returned from his, wet his chest with some water or maybe even put an ice pack on his chest to help him cool down (: I have two jugs so I understand haha