hello mate , i have just been through the same thing with a springer, who is 8 and the vets told me to bring it in and have it checked over which costs £35 notes, to which i did and they just check the over all condition of the dog, heart, lungs,and if she pass"s then he gives you the all clear, the down sides to breeding from older dogs is they sometime give up pushing the puppies out because they dont have the energy to finish, should this happen the u will need to take her back to the vets for them to give her oxytocine, which will make her start pushing again, which was needed for mine, b