I know most breeders give the puppies at least one bath before they go home, so younger then 12 weeks. I've never had a dog with kennel cough so I'm not sure. I would have her check with her vet. There are some waterless-shampoo products out that she could try.
No Rinse Shampoo (11.6oz.) $8.95Pet Silk No Rinse Shampoo is the perfect puppy product ... This gentle shampoo does not need to be rinsed out and is effective for cleaning puppy faces and other puppy parts.[/B]