This is Dr. David
I can see you are concerned with your grandchildren.
if the kids go to preschool or play with other children, the most likely are exposed to a lot of germs and viruses and allergies which can cause colds, bad breath, sinus congestion, runny nose and green mucus.
they could even have allergies to dust or animal dander or seasonal allergies as well.
the dog won't give them rheumatic fever.
they may benefit from taking allergy medications and being tested for allergies.
they will benefit from washing their hands more and avoid touching their face and nose with dirty hands.
but it sounds like they have working immune systems that have kept them as healthy as possible up to this point.
I hope no one smokes at home either. a parent who smokes can cause irritation and to the lungs and sinuses as well
let me know if you have other questions.
if done for now, please leave positive rating of 3-5 stars so I can get credit for helping you today
we only get credit for helping clients after positive feedback
you can always reach me directly with "a question for Dr. David" in the medicine or oncology categories if you have other questions
here is my website if you need to reach me:
Thanks for using JustAnswers.com