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Hello, and thanks for writing in.
What you did is perfect - withhold food for 12 hours, then start offering small amounts of food, rice, etc. The small amount of yogurt and the famotidine is also fine to do.
She may just have a simple stomach upset again (gastritis), but with the holiday coming up (and most clinics will be closed for a couple days), my best recommendation would be to have her examined before the holiday, to see if there is anything else that needs to be done to diagnose or treat her. I would rather play it safe and get her seen now, versus waiting, and then have a problem arise when clinics are closed.
I hope this helps. Please let me know if I can assist you further.
You're exactly right - the vaccine is very good, but not 100% effective (no vaccine is 100% effective, but they are close). Plus, there are less common causes of "kennel cough" - outside of what the vaccine protects against. The vaccine just protects against the most common infectious organisms that cause kennel cough. Yes, if she was just boarded, and now has these symptoms, kennel cough (tracheobronchitis) would be more likely, and she may need antibiotics, if your veterinarian feels that would be appropriate for her. Cough medication may also be prescribed, if it's needed for any bad coughing fits.
Please let me know if you have further questions, of if I can help further.