I have a jack Russell mix,(2yrs old) the dad is a yorkie. she has been panting heavily for about 12 hours on and off, she is in a dark quiet place, and I am not sure how long before she gives birth to a puppy?? She has been very restless, she has had some discharge, and there is milk present, not dripping, but there. this is our first time breeding any of our dogs. I am somewhat prepared, but nervous just the same.