not pregnant,she has a healthy appetite (very hungry today),and drank lots of water. She and my other female same breed dog had a fight which I broke up, and the dog in question had a hurt leg from the fight. But she isn't limping no more. Could it be that it is hurting her. Her panting alternates, now with wheezing sounds (not unusual for her when she rests).She was treated for Heart worms 3 years ago, but I did not continue medicate her for them. I thought a one time treatment is all it took.