Yes, I heard around 6 months.
A few months ago, our 11.5 year old poodle went in for exploratory surgery after having a sonogram. While in surgery they found she had severe cancer and did not even think she should be brought out of surgery. She was put to sleep that day. For this reason I think the entire family is having a hard time letting the new baby go in for any surgery, no matter how minor it is. So we are just trying to put it off as long as possible especially since she is so small. However, we do not want to wait too late and let her experience the first heat, however, we are not sure what age this happens, as all of our other pets have been spayed at 6 months old.
Thanks Elissa