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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern about Jasmine.
It sounds as if she may have a sinus infection or possibly allergies or (worst case scenario) a mass in her nose.
But, if she appeared to respond to antibiotics and an antihistamine in the past when she has this problem, then she may respond again. The problem with diagnosing a chronic problem such as this is that usually advanced testing such as an MRI and/or rhinoscopy is needed to determine the underlying issue.
The dose of Loratadine that I'd use for a dog this size would be 10 mg twice daily; sedation may be seen as a side effect (which you probably already know).
The dose of Amox-Clav (aka Clavamox) for a dog this size would be 875 mg twice daily, with food to avoid stomach upset.
I hope this helps. Deb