Hi there! It is imperative that you keep him away from her at all costs. He could make her miscarry and it is not good for her (Stressfull) Maybe keep a spray bottle handy and give him a spray when he gets too close to her. I have a dog and when he barks my cat (pregnant and grouchy!!) tries to swat him...so I keep the spray bottle handy since she is not declawed. Good luck and best wishes to you all! Keep us updated!