Aggresive female cat

Question
I have two year and a half old cats that have been together since they were 8 weeks old. One Male one female. She had a litter of two kittens about a month ago.  The male would curl up with her in the nest and the four of them would sleep or clean each other.  Tonight the male cat tried to jump into the box (nest) and the female cat went crazy.  She rolled him out of the box and chased him around the house.  She even attacked mt 125 pound dog and got him running out of the room.  it's been hours and everytime she sees him she pounces beats the tar out of him and chases him around the house.  What, if anything, can or should i do.

Answer
Tim,

I would get the male fixed as soon as possible, and the female fixed when the kittens are eating solid food. A cat can get pregnant again as soon as 48 hours to 2 weeks after having kittens. The male cat may smell the female's 'kitten heat' and she is reacting to it.

For some reason she feels that the kittens are being threatened or in danger. I would try to keep the male away from the mom and kittens and let the mother settle down. Being stressed can affect her milk flow. For some reason she feels that the kittens are being threatened or in danger.

Tabbi