We had a rescue dog who went into heat. Her heat lasted about 10 days and the vet did ask that we wait to have her spayed until after it had ended. We have tile floor and so simply mopped behind her as she went through the house, but I know the woman across the street who breeds little tiny poodles uses those disposable doggie diapers when hers are in heat and in the house. I have seen them atPetsMart. Make sure to keep her inside or be with her when she is outside in case a male dog finds her (and they will).