Next time comment on the size of their kid.
Your point about the spay is interesting - I found this a while ago on Dr Sophia Yin's site:
"According to Katherine Houpt, VMD, PhD, DACVB, director of the Animal Behavior Clinic at Cornell University Hospital for Animals, spaying may actually contribute to behavioral problems. In a cooperative study with the Institute of Animal Medicine at Gyeongsang National University in Korea, Houpt and her colleagues found that ovariohysterectomy (spay) in healthy German Shepherds bred as working dogs led to increased reactivity."
If you're interested what led to these findings, the link is here:
Can Spaying Lead to Bad Behavior? | Animal Behavior and Medicine Blog | Dr. Sophia Yin, DVM, MS