Maybe print instructions in a legible typeface? My dog has ½ what you call a serving (on the bottle) so I'm guessing that means he's getting ½ of a dose. Maybe that's why it's made no difference to him. In fact, I'm afraid he's getting worse so I'm looking for something else.
Also, each bottle lasts him 120 days yet you still insist after a month he needed another 2 bottles, even though he's still on the first bottle. So we've now got 4 bottles that will never be used.