My almost 14 yo Chihuahua has been having severe bouts of sneezing, sniffling, rubbing eyes, etc. When I brush his teeth, I notice one of his tricuspids (just medial to canine) may have decay (he had a cleaning about 5 months ago, no teeth were pulled) and when I brush there, it triggers one of these allergy-like attacks. Would you recommend dental x-rays? I dislike the idea of anesthesia again at his age but I wonder if a hidden infection in a tooth could be causing this.