This ia thew info my vet has given me regarding trimming whiskers in a dog.
The whiskers are highly sensitive touch organs for a dog. A dog's whiskers may sense the wind direction and so help the dog determine the direction from which an odour is coming. These whiskers occur in clusters and serve as sensory structures - anything brushing against these whiskers stimulates the dog to close his eyes, pull away, turn his head, paw his face, or shake his head. Some exhibitors trim the whiskers of their show dogs to give the dog's head and face a smooth look. More importantly, it gives the judge a nice smooth feel in the ring. But such trimming may limit the dog's response to his environment and detracts from the natural appearance of the pet.
I would never trim the whiskers and in Germany they have disqualified show dogs if their whiskers are trimmed