How do I stop my dogs bum smelling so so bad?

tell me about it I have one that is now 13 and gives out some real smellies my family for generations have bred staffis and have been told by vets and professionals that they are a breed prone to smells because of the muscle tone and compact bowl es but keep her on good quality food and plenty of fresh water walks cause if she is anything like my old fella they poo for england too its only when they get an obviously constant upset tum and loose stool that you do need to see a vet enjoy a beautiful doggy