Should dogs have puppies at 9 months?

A male dog may well be sexually mature by this age, though some breeds take 15 to 18 months. A female dog can become pregnant as soon as she has her first oestrus, but it's a bad idea to let her have a litter until she is over a year old and has completed the first oestrus. She may not be fully grown and may not have room for the pups, which can be very dangerous.