There are graduated measurements indicat d at 250lb intervals on the applicator. There are a number of notches across the plunger rod of the applicator. These can be used to help gauge dosage relative to the graduated intervals labels. These graduations are etched/embossed at; 250, 500, 750, 1000, 1250 lb's worth of horse weight. You can use this info to extrapolate how many notches, should be given to your other critters based on their weight. Gets you down to maybe a 15-20lb interval scale.