Noisy dog

Hi All

Our little pika has been really norty recently! Ever since she has been spayed she is barking at everything! If she hears someone walking past our house she barks her head off, when were out and sees another person or dog she off again and last night at the vet I was mortified with the noise she was making! She has always been a little bit barky if someone comes in the house but never anything like this, she sets Fudge off doing his supersonic Chihuahua bark as well!

Could this change have something to do with her being spayed?