My maltese puppy Haru began having bad tearing and stains at about 6 weeks, he also had brown ear dirt. I read on the net that ear infections and tear stains were related, anyway I got stuff from the vet to clean the ears and ear mite stuff from the pet store. Although the ear cleared up the tearing was still there. Then I read on the net about ACV and green beans. I add a tiny bit to his water every day and mix green beans (about 4beans) into his meals htrough a mixer. I think ACV definitely cleared his alkaline system, especially since before he left a very slimyness to his bowl.