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Hello and thank you for using this site to help you. If the dog is spayed and there is a discharge with odor and color you really need to get your girl to a Vet for a check up for infection. If not treated she could become ill fairly quickly. She will likely need oral antibiotics which you can only get from your veterinarian. Healthy dogs should not have any discharge.
Here is more on vaginal discharge in dogs including causes and treatmentshttp://www.petplace.com/article/dogs/diseases-conditions-of-dogs/symptoms/vaginal-discharge-in-dogs