
Re temperature, I thought I had better take my bitch's on Friday morning last week and it was 36 point something, so I knew she was getting close. She went into second stage labour early Saturday morning and whelped 7 pups between 8 and 10am.
The panting could just be the very humid weather we've been having lately. Of course it could be she is "starting" but my girl panted heavily (and sometimes very fast) for the whole night before she whelped. It's not the normal kind of panting, they almost chug like a train...lol! They also stare into space a bit if other bitches are anything like my girl, and will also dig their bed up or start digging up outside. I threw a whole load of paper, towels, and old blankets into the whelping box to help her satisfy the urge, and she dug up there.
Have you got a nice quiet place ready for her to whelp? When she's ready, she won't want to let you out of her sight not for a minute, especially if it's her first litter.
Even though I knew she had been in the first stages of labour for a good few hours, I was almost shocked when I saw the first contraction, and excited!
Good luck with your girl, I would think she'll be ok for now, but don't leave her too long on her own, she may surprise you!!