Don't fret about precise dosing. This is a safe med that has little risk of overdose. I dispense with measuring and simply pry open the beak and squirt in a mouth full like whipped cream. Or you can squirt about half an inch of cream onto your finger, pry open the beak, and wipe the cream off your finger into the open beak.
Regardless of amount, be sure to give two times a day for a full seven days.