dog does not like new puppy

Question
My Maltese does not like my new chihuahua puppy.  She isn't aggressive but will growl if he comes near.  We also have a Pekengese and he has no problem with the new puppy.  I should mention that the Maltese is 5 wks pregnant, could this be the issue? She has NEVER had aggression issues and usually is very nurturing and loving to everyone and everything.  

Answer
Hello...there are many different things that can cause what you describe. It is most likely the pregnancy and if you can wait it out that would be good. My best suggestion though, would be to call a behaviorist for a free evaluation to be sure before the pups come. good luck
nancy