With antibiotics the dog is usually back to normal in 36-48 hrs. Where normal is defined as appetite and energy levels restored with no sign of the recent illness. Without antibiotics and assuming the dog is not a puppy or geriatric then 1-2 weeks to fully recover. Pneumonia can be a complication in young puppies or in very old dogs if not treated with antibiotics.
Incubation time is 2-14 days. There is an extremely high probability any dog in a contaminated environment unvaccinated is likely to come down with it as its extremely contagious.
Vaccinating before clinical signs appear, may help a little to shorten the illness- assuming it takes a week thereafter for clinical symptoms to develop. Once clinical signs are present, vaccination will have no effect on the duration of the illness.
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