My 6 month old APBT pup has been acting strange for a few days. Normally playful and social she's been listless, whines near constantly, not much interested in playing, just looks at me and whines. I've not put a thermometer into her since I can't find it but she doesn't feel hot. I've had a few guests come by, and she perks up for the visit, shows off a bit but goes back to the listless whining after the excitement wears off. My first thought was that maybe this is the first heat coming on but a look under her tail shows no sign of swelling, and I don't know if the behaviour change comes before the physical signs or not. I'm pleased to say, that I just had to take a 10 minute break from writing this. She brought her Kong to me and vigorously chased it for a while as I chucked it down the hallway. Just for reference... She's not had enough exercise the last month or so, since the weather has been so crummy and she doesn't like the rain one small bit, and it rains here constantly this time of year. She's also a pretty sensitive dog too. Shivers and yawns a lot when she's uncomfortable, has been scolded. She's also been slightly off her grub. Only finishing half of her portion or so and pecking at the rest over the day. So, I thought I would throw this out there to you other dog people. Do bitches have a temperament change before they show physical signs of being in heat? Any other thoughts?