There isn't much you can do to calm him down. "Heat" is a 3 week cycle. So if he has only been acting crazy today....you are maybe halfway through. And yes she can get pregnant the first time around. You are right not wanting her to, puppies for a puppy could kill her. I breed labs and also have a beagle....he howls and whines for 3 weeks straight. I feel your pain. If you go the vapor rub route, put it between his shoulder blades so he can not lick it off. It may help some.