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Dogs do not get colds such as humans do but they can get different forms which are similar. She can have Kennel Cough which is very common in dogs. While this is most commonly transferred in kennels it can also be picked up just about anywhere from dog parks to vets offices. This can also be brought in on your shoes. This is very very common in dogs from shelters and the incubation period is around 2 weeks. Parainfluenza is the most common and most contagious of the dog colds, and is passed by the sneezing and or coughing of the dogs.
You can bring her into the bathroom and run hot water to create steam to help break up any congestion she is having. A warm wash cloth can be used to gently clean the eyes. Make sure she is eating and drinking. You can give her some unflavored pedilayte to prevent dehydration from the dog cold. Rest and time is the best cure unless it gets worse. You can take her to the vets office to make sure it does not become a infection. Your vet can prescribe nose drops and cough drops as well to help clear this up. Your vet may also want to prescribe a antibiotic to help get her over this faster.
Robittisun can be given with vets approval. Here is dosage instructions: http://www.petplace.com/drug-library/dextromethorphan-robitussin-dm/page1.aspx