Ive actually seen my male dog around a female dog in heat, he was actually well behaved. he didnt try to hump her, however i could tell he was interested in her. He did keep smelling her, he tride to play with her but only her face and ears was he interested in. He still listened to me, and relativly was ok with leaving her alone. I had no problems with him around her. She had doggie pants on, i dont know if that made a differance, but from what ive heard and read i dont think it could have. I consider my male dog to be a little sissy LOL.. so he's more girly and sensitive then any girl dog ive ever owned or had the pleasure of meeting. He was the only boy surrounded by all girls growing up, and when i got him from the breeder she informed me that he was a mommas boy. I really think it has to be in a dogs character to act in that way, and i also think the dogs does what it feels thier owner will allow.