Need advice please! In the last few days, my almost 11 year old bullie has started having episodes where, when he gets hot, he seems to be gasping for air. It's not the typical panting, and it's not reverse sneezing. It's more of an actual gasping sound. When he cools off and calms down, it completely stops. He has "hacked" a few times in the past couple days, and seems maybe to have a little bit of a stuffed up nose. He's otherwise fine. Eating, wanting to play, going to the bathroom regularly, etc. The doctor said it may be related to his severe allergies and suggested I try Benedryl. I'm worried though. This is something new for him. Anyone seen this before?