Will your dog get dog aggressive if she is pregnant?

It all depends on the dog. If your dog is an aggressive Mastiff, Bulldog, Doberman Pinscher, or one of those "aggressive dogs", yes, they might not want to be around others. That goes for humans too! It also depends on how your dog normally acts. If they're always aggressive, then yes, they may not want to be around others. I hope this answers your question!