Q. Infection in gums causing Brown drainage from eyes and stained fur where ever he bites. Antibiotics were used to clear it up a year ago.
DR. CHRISTIE LONG, D.V.M., C.V.A.
A. It's kind of unlikely that an infection in the gums is causing brown drainage in the eyes. There is a substance called porphyrin that's in both tears and saliva. When white dogs like Bichons have excessive tearing, their fur is often stained under their eyes. You'll see the same thing if they lick themselves excessively.
As far as the tear staining goes sometimes it's effective to try to open up the tear ducts with a canula (a hollow needle) while under anesthesia. This prevents the tears from spilling onto the fur. There's also a product called Angel Eyes that contains low doses of the antibiotic metronidazole, and for some reason that seems to decrease tear staining as well.
As for the chewing you need to talk to your vet about why he's chewing - he may have fleas, mites/mange, or allergies.