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If she just came home from a kennel, she could have an upper respiratory infection OR kennel cough. Both are highly contagious.
It could also be allergies. Some dogs have them more than others. And it IS the season for allergies for all of us.
If it does not clear up in the next couple of days, you will want to see the vet for antibiotics and an allergy diagnosis.
Let me know if you have more questions.