Wilder W H, McCaffrey T V, Malm L, Kern E B
Otolaryngol Head Neck Surg. 1983 Dec;91(6):643-7. doi: 10.1177/019459988309100610.
Nasal secretory activity was measured in seven dogs in response to topical stimulation by histamine and methacholine. The methacholine response was blocked by atropine but not by chlorpheniramine. The histamine response was blocked by chlorpheniramine but not by atropine. These results suggest that there are two independent mechanisms of nasal secretion in the dog.