Antibiotics are usually only given if there is a high risk of a secondary infection, like pneumonia.
Usually, in an otherwise healthy dog, it will run its course in under two weeks.
I don't know what the incubation period is, but I know my Boo was in a shelter for 3 hours and got it less than two days later... Then again, it's really dense in the shelter compared with one dog in your home...
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