I know that labs as a whole are not really tolerant of the heat, but Sammi seems to be particularly sensitive. She does fine if there is water around, I mean for her to swim in. Today it was around 78 not all that hot, I took her for a short 20 min. walk, it may of been a brisk walk, but no running or retrieves and she was panting pretty hard by the time we got home. Is this normal, I don't remember her being like this last summer, but then I have always been very careful not to let her get over heated. Just had me a little worried!