How is your dog feeling now???
You shouldn't give your dog any cough syrup. The dog needs to see a veterinarian to find out what's causing the cough. It could be something simple, or it could be very serious.
Hi
Peek is right, your dog should see a vet.
Years ago I gave our dog human cough medicine but only after the vet recommended it.
lonewolf
Sounds like Kennel Cough. Especially if she plays with other dogs, or was recently kenneled. She may need antibiotics.