You can give a lower dose with less frequency than directed on the bottle and still have positive results. For my malti-poo, one small half teaspoon clears him up in just 1 day. His eyes are pretty clean, this is just a maintenance item. I'm sure a dog with serious and long-term tearing issues will take quite a bit more time and doses to clear up.
This is true. We've been fiddling with the dosage on our Maltese. I didn't even know about this product until a month ago, but it came recommended by our vet. Since then, her stains are still visible, but fading. Our dog has separation anxiety, so she cries a LOT. If your dog isn't much of a crier, this bottle may last you for awhile