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Hi, I can help you with your question today.
This is a common problem, particularly in long haired small breed dogs.
There is a prescription product called Tylan (tylosin) which clears up tear staining very effectively.
This used to be available OTC in products like Angel Eyes, but the FDA has restricted the sale of these products. It will only be available through your veterinarian now.
You will need to request it from your regular vet - it is a low dose of an antibiotic, so they may not feel comfortable with that. The concern would be that long term use of an antibiotic could encourage antibiotic resistant bacteria.
There are many other options to try such as warm compresses or brushing a light coating of vaseline over the hairs, but I haven't found anything else as reliable as Tylan. Please let me know if you have further questions. I am happy to continue until I provide the service that you seek.