How to find whether my post nasal drip is due to dog allergy?

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Better than a blood immunocap test is the skin prick test. The skin prick test is the gold standard for allergy diagnosis. It is possible that you are allergic to animal dander but that is not picked up by the bloodwork. Before doing the skin prick test you must stop the antiallergics for a week. Meanwhile, you see how your symptoms are during the period when the dog is with your in-laws. Subsequently when the dog is with you, if you redevelop symptoms, then we can be sure like you said, that you are indeed allergic to her.

Meanwhile, have you ruled out other possible causes of the allergy? Do you suffer from any medical conditions like diabetes or hypertension?

Hello,

Welcome back to icliniq.com.

It is true that you get allergies soon. But usually, an allergy develops after a period of sensitization. First, your body has to get sensitized to the allergen, say the animal dander. Thereafter when exposed to the allergen again, the body produces an excess of secretions and inflammation. It is therefore possible that you start showing the symptoms after a couple of months since you start getting exposed to the allergen. Swollen nasal membranes and recurrent postnasal drip are definitely due to allergies unless you find some other cause. Have you had any endoscopy or CT (computerized tomography) scan of the nasal cavities done for this purpose? Has the local ENT ruled out other cases before concluding this as an allergy? Are you better off with the steroid sprays and Rhinocort and Azelastin when the dog is around?