Adjust dosage
You may want to try to adjust the dosage of the benadryl. I have given Scooby a whole capsule before without problem. He's about 25 lbs. He's allergic to fleas and turns pink upon exposure. The benadryl doesn't help all the time either.
Check the environment. Do you run the air conditioning? Air conditioning or laying near the vent may effect the dog's sinuses. Are their smokers in the house? Do you use a carpet freshener? Something the dog is being exposed to on a daily basis may be the issue. Have you changed the dog's shampoo?Chemicals on the grass near where the dog pees?
Experiment a little to see what things typically effect your sinuses in the same way. Something is irratating the inside of your doggie's nose. Good luck!
Scooby, Shaggy the "Dogs", Ms. Thang the "Cat" and introducing Measley Weasle "The Ferret".
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