Can you breed your staffordshire bull terrier on there first heat?

Firstly, a general rule of thumb is to not mate your dog with her first head, but only with her second heat at the earliest. Before going into heat the female will show signs by having a swollen vulva and this will be followed by blood. If the blood is red she has just started with her heat period. Only once the blood becomes more a straw colour is she ready to mate. On which day this will occur varies with individuals, on average most females takes 11 days before they are ready to breed.