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					Originally Posted by margot.  This is my BIGGEST worry!!  I mean...Banks is super mellow and calm and wonderfully quiet now and I really really don't want him to be troublsome, yappy and aggressive after surgery.  He's already microchipped, and the vet's estimate included bloodwork and pulling out baby teeth..but I really don't want his demenor to change.    
so many factors to consider...  | 
 
  If their personality changes, it generally doesn't make them hyper... it's just the opposite, they'll usually be more relaxed.  Although out of all my dogs only 1 became more mellow (which was a good thing).  The rest didn't change at all.