I have had dogs most of my life, mostly small. But Barbie (my first chi ever) is turning out to be really small. She will be 5 months on June 3rd. I weighed her yesterday and she weighs 30 ounces. The vet said that spading should be done at 6 months. I am SCARED to have her operated on. Please tell me what you guys think. I read all the advice and I have learned so much here on how to take care of my little angel. She is healthy, happy, eats great, plays great. She is the best pet ever. But she is so little that I am afraid. :?