I have a pomeranian and she seems to always be breathing in a light pant, even if it's cool inside. She has never done this before, well until she met another pomeranian who had a problem with doing that too. She just breathes through her mouth in a light pant and I'm starting to wonder if it's something to worry about. We actually thought she was just doing it to copy the other pomeranian lol. because she didn't start until about a few weeks after she first me the other pom.